EXPLORE SCIENTIFIC 3" 0.7x Reducer/corrector

3" 0.7x Reducer/corrector

  • Reducer and Field Flattener
  • Reduces the focal length by 0.7x
  • Flattens the field for astrophotography
  • Developed for ED127 and ED152 APO telescopes
  • Free aperture of 65mm for large sensors
  • Works very well with most coma free systems: apochromats, RCs, Meade ACF

€419.00*

Available, delivery time: 1-3 days

Product number: 0510360
GTIN/EAN: 4007922002903
WEEE-Reg.-Nr.: DE 34716369

With BRESSER, you can enjoy a smooth introduction to the vast world of astronomy. Our detailed information ("Telescope Guide") provides valuable tips for beginners—but even experienced astronomers can use the information we provide (e.g., tables for the geographical latitude of all major world cities) as a reference.

Here is the table of contents of the comprehensive BRESSER Telescope Guide:

Sky Guides von Bresser

Der Sky Guide bietet umfassende Informationen zu Sternbildern, Planetenpositionen und astronomischen Ereignissen – ideal, um Ihre Beobachtungen zu planen und noch tiefer in die Astronomie einzutauchen. 
Besuchen Sie den Guide direkt hier, um das Beste aus Ihren Beobachtungen herauszuholen!

Explore Scientific ED 127 CF – FCD01 compared to FCD-100

A product test: two models in direct comparison. Von J.S. Schlimmer

1. Introduction

2 Explore Scientific ED 127 CF Explore Scientific ED 127 CF

Figure 1: Explore Scientific ED 127 CF models under test

Since April 2016 I own the apochromatic one Refractor ED 127 CF, Model FCD01 by Explore Scientific and I use it for moon and planetary observation as well as for the photography of extended nebulas, open star clusters and galaxy clusters. In addition to the very good look, the possibility for photographic use with the help of a focal reducer, also the low weight of the telescope has influenced my purchase decision. Therefore, I could continue to use my old mount and invest the existing budget in optical accessories. The telescope is still transportable and thus suitable for mobile use outside the light-polluted cities. Explore Scientific is listed as a Bresser brand. The technical support I approached initially for some questions was very friendly, accommodating and very helpful.

2. Description

The ED 127 CF has a three-lens lens. Between the lenses there is an air gap. The tube is made of carbon fiber and processed to high quality. The ED 127 CF has a three-lens objective. There is an air gap between the lenses. The tube is made of carbon fiber and processed to high quality. Thanks to its low weight of only 7 kg, it can still be carried by a GP-DX or comparable mount.

Since November 2016, the improved FCD-100 model is on the market, which is advertised with high color purity and a perfect optical design. What’s the difference between these two models? To test this, Bresser has kindly provided me with an ED 127 FCD-100.

At first glance, both models resemble each other like twins, as my older model also has the 2.5-inch Hexafoc extract. In addition to the stable construction, it can also be rotated as a whole. In astrophotography this offers the advantage of preserving the focal position, even if the camera needs to be realigned for another object. The 1:10 reduction allows an exact focus. A scale applied on the pullout facilitates the presetting (Figure 2). In the case of visual observation the zenith mirror can of course be adjusted independently of the focuser.

Focal Reducer

Figure 2: Camera, 0.7x Focal Reducer and Hexafoc Extract

Both models have an aperture of 127 mm and a focal length of 952 mm. In lens labeling, the new model differs only in the additionally printed model designation. Only by closer inspection you can see that the tube of the new model FCD-100 is 15mm shorter. This is a great advantage, because my intrafocal area is very short on my own model. Therefore, in my model, orthoscopic eyepieces (e.g. measuring eyepieces) cannot be used if the extension is provided with an extension sleeve. With my wide-angle eyepieces the extension sleeve always comes to commitment.

3. Objective lenses

For observation I prefer to use wide-angle eyepieces. For almost 2 years my Nagler range has also been supplemented by eyepieces in the 82° series by Explore Scientific. For the telescope comparison the Explore Scientific 2-inch eyepiece with 24 mm focal length, as well as two Explore Scientific 1 ¼ inch eyepieces, with 8.8 and 4.7 mm focal length were used.

4. Explore Scientific 0.7 focal reducer and corrector

of 64 mm (2.5 inches). To connect to Canon cameras, a special T2 adapter must be used. The adapter ring is only 1 mm thick and therefore made of steel. He has a free opening of 36.7 mm.

5. Visual tests

Explore Scientific Okulare der 82° Serie

Figure 3: Explore Scientific 82 ° Series Eyepieces

In particular, moon and planets are suitable as test objects for the visual comparison, while in the deep sky range the Orion comes into question with its richness of detail. Open star clusters, on the other hand, offer a very good opportunity to assess the edge imaging at low magnifications.

For the tests, the objects should be as high as possible in the sky, where the influence of astronomical seeing is significantly lower. Because the planets only reached a height of 23° at the meridian passage at the time of the tests, they were out of the question for the tests. For better temperature adaptation, the telescopes were brought to the open air 1-2 hours before the tests.

 

Aldebaranbedeckung

At dusk on the 23rd of February In 2018, Aldebaran was covered by the moon. The picture above shows the moon a few seconds before covering on the bright Sky. The small image inside shows the entire image field during the covering. The picture below shows the moon for one hour at the end of the Aldebaran covering. ES 127 FCD-100 and Focal Reducer, Canon 1100D

a) The moon

With the 2-inch 24 mm eyepieces, the moon fits comfortably in the field of vision. While the FCD01 showed a light, yellow color fringe around the bright edge of the crescent, the image of the successor model FCD-100 was without any color aberrations. The higher the magnification the more details revealed on the lunar surface. The sight became really fascinating at 200x magnification with the 4.7 mm eyepiece. In the Apennine Mountains were already single, larger rock formations to recognize. In the south, on the edge of the Mare Nubium, the Long Wall was just visible, an approximately 100 km long embankment. The crater Thebit could be easily observed on one side of the long wall and Birt and the side crater Birt A on the other side. On closer inspection you could see further small craters such as e.g. Thebit D at the end of the long wall. Also Rima Birt, a groove that runs almost parallel to the Long Wall, but only as half long, was easy to see. Below are some pictures of the Aldebaran covering from 23rd February 2018. The beginning was still in the clear sky, so that Aldebaran was difficult to locate. At the exit one hour later the sky was already dark.

b) Open star cluster: Pleiades and NGC 1647

For the observation of the Pleiades also the 2-inch 24 mm eyepieces was used. With this eyepiece, the Pleiades are a breathtaking sight, because they fit completely into the field of view. In both telescopes, the stars were as fine as needle points and point-shaped to the edge. Visually, no color errors were noticeable. It was such a perfect sight.

NGC 1647 is a very loose open star cluster nearby 97 Tau. Because it is very extensive, it is best seen at low magnification. Approximately 20 stars with a brightness of 8 mag can be captured well with the 2-inch 24-mm eyepiece. Again, the sight is fantastic, as the entire field of view is sharply displayed.

c) Stars and binary stars

Intra- und extrafokale Beugungsscheibchen

AFigure 5: Intrafocal and extrafocal diffraction disks

What about the comparison at high magnifications? Inadequate color correction of refractors is shown by blue color fringes around bright stars. To test this, the choice fell on Bellatrix, the "warrior" in Orion. This star is 1.6 mag bright, bluish giant star of the spectral class B2. At moderate magnification with the 8.8 mm eyepiece (108x), neither the CD01 nor the successor FCD-100 showed any fringing. At high magnification with the 4.7 mm eyepiece (203x), diffraction rings around Bellatrix were clearly visible, but no fringing. However, at this magnification already the atmospheric dispersion was noticeable, as Bellatrix only reaches a height of 46 ° in the meridional passage. The atmospheric dispersion is shown by blue color in the upper area and red color in the lower area of the star. However, it is an atmospheric effect and not due to the telescope optics.

In the constellation Orion there are also numerous binary stars, which can be used to test the resolution. For example, 32 Ori (STF 728) could not be resolved at a distance of about 1.2 arcseconds. For 52 Ori (STF 795), which has a spacing of only 1.0 arcseconds, both components could be detected but not completely separated. The reason for this is in different contrast: the components of 32 Ori have a brightness difference of 1.3 magnitudes, while the components of 52 Ori are equally bright. The observation of Alnitak (STF 774), the eastern belt star of Orion was also interesting. With a distance of at least 4.7 arc seconds, this double star should be easy to separate, despite its brightness difference of 1.8 magnitudes. At 203x magnification Alnitak was also clearly to separate, however the B-component could only be seen at second glance in the diffraction rings. With the 8.8 mm eyepiece Alnitak was inseparable. Of course, with this type of observation, astronomical seeing plays a crucial role. Unfortunately, lunar observation was only possible with good astronomical seeing. At all other tests the astronomical seeing was not very good. In conclusion, the difference between the two models FCD01 and FCD-100 is hardly noticeable in visual observations.

6. Photographic tests

a) Diffraction slices in the primary focus

To get a better overview of the color difference between the two models, the defocused diffraction discs were first used recorded in the primary focus at 952 mm focal length (Figure 5). For this a QHY 5L II-C color CMOS camera was used. The images were taken at a distance of -2.2, -1.1, 0, +1.1 and + 2.2 mm from the focus. The light source was Bellatrix.

Overall, my model FCD01 showed slightly more color differences between the intra- and extra-focal diffraction slices. In the intrafocal area it appears slightly greenish, while in the extrafocal area it shines reddish. The successor model FCD-100 shows no color differences between the intra- and extra-focal diffraction disks.

Orionnebel

Figure 6: Orion Nebula 16 x 30 seconds, 800 ASA, ED127 CF FCD-100, 0.7 x Focal Reducer

a) Astrophotography with the Explore Scientific 0.7x focal reducer

Bellatrix und Beteigeuze

Figure 7: Bellatrix and Betelgeuse, 5x30 seconds, 800 ASA

Beteigeuze

Figure 8: Complete picture of Betelgeuse, the inlays show the Star illustrations in the corners on the lower left and upper right

The photos in this review were taken with a modified Canon EOS 1100D. It can also be used for the absorption of hydrogen regions due to the lack of red filter. For the recordings, the camera was connected directly to a laptop via a USB cable and operated exclusively via the Canon "long-distance shot" menu. The focus was set on the live image in 10x zoom mode. Exposure time and sensitivity were also controlled via the laptop. The pictures could be viewed directly after the picture was taken on the screen. The pictures were taken with an exposure time of 30 seconds at 800 ASA. To reduce noise, flat and dark images were also created.

With my FCD01 model, the sharpness can be easily adjusted by the color of the diffraction disk. As soon as the color becomes minimal, or changes from a slight green cast to reddish, the perfect focus is found. This method always worked well and led to quick results. In which Successor model FCD-100, this method could not be applied due to the color purity. Therefore it took some practice to find the right focus. A self-made focusing aid has proven to be helpful. The focusing aid consisted of a ring that was placed on the dew cap. Attached to the ring was a thin ridge that ran through the center, creating a one-dimensional diffraction pattern in the image. Based on the diffraction image was the adjustment of sharpness.

The focusing aid was removed again for photography and bright stars in Orion were once again chosen as test objects. Figure 7 shows Bellatrix (spectral type B2) and Betelgeuse (spectral type M2) taken with the FCD01 and the FCD-100. Exposing time was 5 × 30 seconds and corresponding flat pictures were taken. The different colors are shown very nice in both models. Due to the red sensitivity of the camera, a correspondingly large halo appears around Betelgeuse.

Für For deep sky shots of extended objects not only the color but also the marginal image is of interest. Figure 8 therefore shows the complete picture of Betelgeuse taken with the FCD-100. The inlays show the star pictures in two opposite corners. The 0.7x Focal Reducer levels the image over the entire APS-C format of the camera. Very red stars in the border area are no longer 100% displayed due to dispersion phenomena. The strength of this effect depends on the spectral type of the star and of course on the red sensitivity of the camera and can be observed only at full image resolution (here 4273 pixels x 2848 pixels).

On the basis of the flat images, the vignetting of the two telescopes could also be determined very easily. The vignetting is shown by the edge darkening of the image field. In both models, the brightness drops to around 77% of the center brightness in the outermost corners. This corresponds to about half an aperture. Figure 6 shows another shot of the Orion Nebula taken with the FCD-100. At the time of shooting, the sky was already lit by the half moon. The colors of the stars are rendered beautifully. There was no color correction during the image process, only the tonal values have been changed. In the predecessor model FCD01, the stars appear on deep sky shots usually with a slight green tint, which is easy to correct in subsequent image editing.

7. Conclusion

In all tests, the FCD-100 has shown no color errors, while the previous model FCD01 still has low color errors. With the improved look of the FCD-100, Explore Scientific / Bresser has reached the limits of color purity in imaging. Bei der Fotografie ist es beim FCD-100 schwieriger den exakten Fokus zu finden wie beim Vorgängermodell FCD01. Eine Fokussierhilfe und etwas Übung verhelfen aber auch hier zum gewünschten Ergebnis. In photography, the FCD-100 is harder to find the exact focus like the previous model FCD01. A focus aid and a little bit of practice help to achieve the desired result. The border image on both models is in conjunction with the Explore Scientific 0.7 x Focal Reducer APS-C format punctiform. The image field illumination is very uniform and shows only slight vignetting. The 2.5-inch Hexafoc extract is built mechanically very stable and can be rotated as a whole. This allows a camera to be arbitrarily aligned with the focus position almost preserved. Due to the 15 mm shorter tube on the FCD-100 compared to the FCD01, the intrafocal area of the hexafoc is significantly larger. This also means that orthoscopic Eyepieces (for example, measuring eyepieces) can be used without removing the extension sleeve. Overall, the Explore Scientific 127 FCD-100 is a fantastic 5-inch telescope that impresses visually and photographically. In addition, it is transportable with a weight of just under 7 kg and is also carried by a GP-DX or comparable mount.
Product information "EXPLORE SCIENTIFIC 3" 0.7x Reducer/corrector"
The EXPLORE SCIENTIFIC 3" 0.7x Reducer/corrector, reduces a compatible telescope's focal length by a factor of 0.7x (for around f/8) and 0.8x (for around f/10) respectively. The reducer/corrector not only reduces the focal length but also flattens the field. Although originally developed for the Explore Scientific ED-APOs 127mm and 152mm, the reducer can be used with many systems - for example with the Explore Scientific ED-APOs 102mm and 165mm (please note, this will not work on the Explore Scientific 80mm ED Apo refractors though). With certain telescope focal lengths, a slight restriction of the correction at the edge of the image field can be expected when using full-frame sensors. This unit comes with 3" barrel adaptor for direct focuser thread M54x0.75 (the standard focuser thread of the Explore Scientific Essential series of ED Apos) and T2 camera adaptor. This reducer/corrector features a free aperture of 65mm, so that it can be used even with cameras that have a large sensor - if the telescope allows for this.

Note: As previously mentioned, this Reducer/corrector comes with a screw on ring, which fits the standard focuser thread of the Explore Scientific Essential series of ED Apos. For telescopes which are equipped with the 2.5" HEX Focuser, the optional screw-on adapter part no: 0510366 is needed. Other telescopes, not in the Explore Scientific range, with standard 2" push-fit focusers will need the Explore Scientific 2" Adaptor for 3" Corrector - part no: 0510364 to get this reducer correctly fitted.

SPECIFICATIONS

  • Reduces the focal length by 0.7x at f/8
  • Flattens the field for astrophotography
  • Developed for ED127 und ED152 APO telescopes
  • Also fits Explore Scientific ED102 and ED165 telescopes - and others
  • Free aperture: 65mm
  • Inner thread for telescope adaption: M76x0.75mm
  • Outer thread for camera adaption: M72x0.75mm
  • 3" focuser barrel adaptor included
  • Adaptor for Explore Scientific focuser M54x0.75mm included
  • T2 camera adaptor M42x0.75mm included
  • Diameter: 78.5mm; length: 100mm
  • Length without adaptors: 52mm
  • Weight without adaptors: 530g

What's Included

  • Reducer/Flattener
  • 3" focuser barrel adaptor
  • Adaptor for Focuser M54x0.75mm
  • T2 camera adaptor M42x0.75mm
  • Dust caps
Colour: black
Material: Plastic

Accessories

EXPLORE SCIENTIFIC 2" Adaptor for 3" Corrector
Connects the 0510360 EXPLORE SCIENTIFIC 3" Corrector/Reducer to optical tubes with a 2" focuser.

€64.90*
EXPLORE SCIENTIFIC Hexafoc 2.5 adaptor for 3" 0.7x Corrector
This adaptor enables you to connect the 0510360 0.7x focal reducer/field flattner to telescopes that feature the 2.5" Hexafoc. The big inner diameter of the 2.5" Hexafoc is fully utilised with this adaptor to avoid vignetting.What's Included1x Hexafoc 2.5 adaptor for 3" 0.7x Corrector ring

€56.00*
EXPLORE SCIENTIFIC Adaptor 3" 0.7x Corrector to M68 x 1.0mm
Connects accessories with the M68x1 male thread to the imaging side of the 0.7x Reducer/Corrector 0510360.

€69.00*
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EXPLORE SCIENTIFIC ED APO 102mm f/7 Alu FCD-100 Alu HEX
Highly corrected 102mm air-spaced triplet apochromat (with three lenses) and aluminium tube and a 2.5" high-precision HEXAFOC focuser.   Apochromats are the ultimate choice in small to medium sized telescopes: the combination of compactness, transportability, very high image contrast and sharpness together with the possibility to make excellent astrophotos cannot be bested. The advances in glass manufacturing during the last few years have made true apochromats available to more astronomy enthusiasts than ever before. The new Explore Scientific FCD-100 Alu Hex represents another major improvement in this field - the overall correction (color and spherical) is setting new standards in this price class. The optical design shows a polystrehl value of 0,97 indicating a level of correction that is absolutely top of the line.This excellent apochromat is a very versatile telescope: the fast f-ratio makes short exposure times possible. The high contrast and sharpness of the image provide breathtaking views of large objects like the North america nebula or the Andromeda galaxy as well as tack sharp planetary images. The telescope is lightweight and compact - the dew shield slides down the tube to minimize size for transportation. Revolutionary glass and precision manufacturing created a telescope that offers observing joy on the highest level. This does not only qualify this telescope as the ideal travel scope, it is also the perfect choice for fast observations and for astrophotography. The excellent 2,5" HEXAFOC focuser with 10:1 reduction is perfect for this - the large inner diameter of 65mm prevents vignetting by the focuser when the telescope is used for astrophotography with large sensors. These very popular EXPLORE SCIENTIFIC Triplet ED APO Refractors we do offer in 3 different product lines:Essential Line: HOYA FCD-1 Glass lens, AL-Tube, 2.0" Rack&Pinion Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112084(AL), 0112106(AL), 0112132(AL)), 0112155(CF + 3"FT)) Professional Line: HOYA FCD-100 Glas lens, AL/CF-Tube, 2.5" HEXAFOC Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112086(AL), 0112108(AL), 0112109(CF), 0112134(AL), 0112135(CF))High-End Line: OHARA FPL-53 Glass lens, Carbon(CF) Tube, 3.0" Feather-Touch Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112165(CF))SPECIFICATIONSAperture: 102mmFocal Length: 714mmFocal ratio: f/7.0Weigth: 4,0kgBackfocus: 150mm above 2" adaptorDesign: Apochromat with three lenses, two air spaces and FCD-100 glassSCOPE OF DELIVERYOptical tube with retractable dew-shield2.5" HEX focuser with 1:10 gear reduction  2" Star Diagonal 99% reflectivityTube rings with dovetail plate and handleDust caps for front-lens and focuserUniversal finder slot

€1,307.00* €1,869.00* (30.07% saved)
EXPLORE SCIENTIFIC ED APO 127mm f/7.5 FCD-100 CF HEX
Highly corrected 127mm air-spaced triplet apochromat (with three lenses) and carbon fibre tube and a 2.5" high-precision HEXAFOC focuser. NEW: Now with hybrid viewfinder shoe to accept different viewfinder holders.    Apochromats are the ultimate choice in small to medium sized telescopes: the combination of compactness, transportability, very high image contrast and sharpness together with excellent astrophotographic performance cannot be bested. The advances in glass manufacturing during the last few years have made true apochromats available to more astronomy enthusiasts than ever before. The new Explore Scientific FCD-100 CF Hex represents another major improvement in this field - the overall correction (colour and spherical) is setting new standards in this price class. The optical design shows a polystrehl value of 0.97 indicating a level of correction that is absolutely top of the line.This excellent apochromat is a very versatile telescope: its reasonably fast f-ratio makes for short exposure times when imaging deep sky objects, but it is still of a significant focal length, making higher power planetary and lunar observation comfortable without having to use really high magnification eyepieces. The high contrast and sharpness of the image provide breathtaking views of large objects like the North America nebula or the Andromeda galaxy, as well as tack sharp planetary images. The telescope is lightweight and compact - the dew shield slides down the tube to minimize size for transportation. Revolutionary glass and precision manufacturing come together to deliver a telescope that offers observing and imaging at the highest level. The Carbon Fibre construction allows this telescope to be used on lower capacity mounts, increasing convenience and portability. Although there are smaller instruments available, the combination of aperture and optical excellence at such a low weight and compact tube makes this an excellent travel scope. The well-designed 2.5" HEXAFOC focuser with 10:1 reduction is perfect for both visual and astrophotographic use - the large inner diameter of 65mm prevents vignetting by the focuser when the telescope is used for astrophotography with large sensors (full frame and above).We offer the very popular EXPLORE SCIENTIFIC Triplet ED APO Refractors in 3 different product lines:Essential Line: HOYA FCD-1 Glass lens, AL-Tube, 2.0" Rack & Pinion Focuser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112084(AL), 0112106(AL), 0112132(AL)), 0112155(CF + 3"FT)). Professional Line: HOYA FCD-100 Glass lens, AL/CF-Tube, 2.5" HEXAFOC Focuser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112086(AL), 0112108(AL), 0112109(CF), 0112134(AL), 0112135(CF))High-End Line: OHARA FPL-53 Glass lens, Carbon(CF) Tube, 3.0" Feather-Touch Focuser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112165(CF))SPECIFICATIONSAperture: 127mmFocal Length: 952mmFocal ratio: f/7.5Design: Apochromat with three lenses, two air spaces and FCD-100 glassWeight: 5.2kg, lightweight due to carbon fibre tubeBackfocus: 150mm above 2" adaptorHybrid viewfinder shoe to accept different viewfinder holdersWHAT'S INCLUDED Optical tube with retractable dew-shield2.5" HEX focuser with 1:10 gear reduction  2" Star Diagonal 99% reflectivityTube rings with dovetail plate and handle Extension tubes for focuser (2pcs)Dust caps for front-lens and focuserHybrid viewfinder shoe 

€2,779.00*
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EXPLORE SCIENTIFIC ED APO 127mm f/7,5 FCD-100 Alu HEX
Highly corrected 127 mm air-spaced triplet apochromat (with three lenses) and aluminium tube and a 2.5'' high-precision HEXAFOC focuser. NEW: Now with hybrid viewfinder shoe to accept different viewfinder holders. Apochromats are the ultimate choice in small to medium-sized telescopes: the combination of compactness, transportability, very high image contrast and sharpness together with the possibility to make excellent astrophotos cannot be bested. The advances in glass manufacturing during the last few years have made true apochromats available to more astronomy enthusiasts than ever before. The new Explore Scientific FCD-100 Alu Hex represents another major improvement in this field - the overall correction (colour and spherical) is setting new standards in this price class. The optical design shows a polystrehl value of 0.97 indicating a level of correction that is absolutely top of the line. This excellent apochromat is a very versatile telescope: the fast f-ratio makes short exposure times possible. The high contrast and sharpness of the image provide breathtaking views of large objects like the North America nebula or the Andromeda Galaxy, as well as tack sharp planetary images. The telescope is lightweight and compact - the dew shield slides down the tube to minimize size for transportation. Revolutionary glass and precision manufacturing created a telescope that offers observing joy on the highest level. This does not only qualify this telescope as the ideal travel scope, it is also the perfect choice for fast observations and for astrophotography. The excellent 2,5'' HEXAFOC focuser with 10:1 reduction is perfect for this - the large inner diameter of 65 mm prevents vignetting by the focuser when the telescope is used for astrophotography with large sensors. These very popular EXPLORE SCIENTIFIC Triplet ED APO Refractors we do offer in 3 different product lines: Essential Line: HOYA FCD-1 Glass lens, AL-Tube, 2.0'' Rack and Pinion Focusser with 1:10, 2.0'' Star Diagonal 99% Reflectivity (see Part No. 0112084(AL), 0112106(AL), 0112132(AL)), 0112155(CF + 3''FT) Professional Line: HOYA FCD-100 Glass lens, AL/CF-Tube, 2.5'' HEXAFOC Focusser with 1:10, 2.0'' Star Diagonal 99% Reflectivity (see Part No. 0112086(AL), 0112108(AL), 0112109(CF), 0112134(AL), 0112135(CF)) High-End Line: OHARA FPL-53 Glass lens, Carbon(CF) Tube, 3.0'' Feather-Touch Focusser with 1:10, 2.0'' Star Diagonal 99% Reflectivity (see Part No. 0112165(CF)) SPECIFICATIONS Aperture: 127 mm Focal Length: 952 mm Focal ratio: f/7.5 Design: Apochromat with three lenses, two air spaces and FCD-100 glass Weight: 7.7 kg Back focus: 150 mm above 2'' adaptor Hybrid viewfinder shoe to accept different viewfinder holders SCOPE OF DELIVERY Optical tube with retractable dew-shield 2.5'' HEX focuser with 1:10 gear reduction 2'' Star Diagonal 99% reflectivity Tube rings with dovetail plate and handle Dust caps for front-lens and focuser Hybrid viewfinder shoe

€2,198.00* €2,349.00* (6.43% saved)

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BRESSER Barlow Lens 5x (1.25")
With the usage of barlow lenses, you can extend the focal distance of telescopes and enhence the magnification of your observated deep sky objects. Thus, you can use the advantages of eyepieces with greater focal distance like the long eye relief as well as a more convenient insight at higher magnifications. Due to their 3-element air-spaced lens design with ED glass, these Barlow lenses provide a brilliant image quality for the whole visual field and are suitable for observations and photography.FEATURESsuitable for observations and photographyincrease fivefold the focal distance3-element air-spaced lens design with ED glassfully multi-coated brass eyepiece clamping ringSCOPE OF DELIVERYBarlow lens (1pc)

€34.19* €49.90* (31.48% saved)
EXPLORE SCIENTIFIC Camera-Ring M48x0.75 for Canon EOS
Camera specific bayonet adapter (camera ring) for Canon EOS DSLR with M48x0.75 mm internal thread for astrophotography. By using the large thread M48x0.75 mm, the vignetting of e.g. a DSLR full format sensor is effectively avoided. Compared to the small T2 thread M42x0.75, this adapter has a free inner diameter of 47.5 mm. This camera ring is made of matt black anodised aluminium and weighs only 40 grams. The light path (overall length) is 10.0 mm. FEATURES Camera-specific bayonet adapter Canon EOS Large female thread M48x0.75 mm Free inner diameter of 47,5mm No vignetting for full format sensors Light path (overall length) is 10.0 mm Made of matt black anodized aluminium Weight only 40 grams SCOPE OF DELIVERY Camera ring for Canon EOS (1 piece)

€24.90*
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BRESSER Erecting Lens 1.5x (1.25")
The BRESSER Erecting Lens creates an upright and right reading image. Furthermore, it increases the magnification by the factor 1.5. The erecting lens serves as a helpful accessory for nature observation or for astronomy beginners and is used for refractors (lens telescopes). Not recommeded to use with reflectors (newtonian telescopes). FEATURESEyepiece connection diameter: 31.7mm (1.25")Magnification: 1.5xSCOPE OF DELIVERYErecting Lens 1.5x (1.25")

€11.00* €21.90* (49.77% saved)
EXPLORE SCIENTIFIC Teleextender 3x 50,8mm/2"
With teleextenders it is possible to extend the effective focal length of a telescope system, resulting in higher magnification for the observation of the moon, the planets or small Deep-Sky objects with the same eyepieces. So you can use the advantages of eyepieces with longer focal length - such as the bigger eye distance and the more relaxed observing comfort - at high magnifications also.These teleextenders incorporate a telecentric optical design that deliveres a excellent image sharpness over the whole field of view and are premium choices for visual observations and astrophotography. The combination of excellent fully multicoating with superior optical design makes the Focal Extenders superior to classic Barlow lenses.FEATURESSuitable for visual observations and astrophotographyTriples the effective total focal length of the telescopeFour lens telecentric designFully multicoatedFilter thread for color or nebula filtersSCOPE OF DELIVERY Fokal Extender 3 x Adapter 2" (50,8mm) auf 1,25" (31,7mm)

€195.00*
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EXPLORE SCIENTIFIC Zero X Field Flattener 2''/M48 for ED80, ED102 and ED127 APO
Field flattener without reduction factor for Explore Scientific ED80 , ED102 and ED127 APO Refractors The imaging plane of many telescopes is not flat but curved. This means that only the area in the centre is perfectly focused - the edge becomes blurred. The human eye can usually compensate for this image property, but a camera shows increasing blurriness towards the edge of the image field. The Explore Scientific Zero X field flattener eliminates the field curvature in many telescopes with a focal length of approx. 480 to 952 mm. The Zero X field flattener was calculated and developed for Explore Scientific ED80, ED102 and ED127 apochromats with focal ratios of F=6.0 and F=7.5. The image sharpness at the edge is dramatically increased. The stars appear round and no longer distorted - a clear benefit for the whole image aesthetics. The Zero X image flattener can be used not only with Explore Scientific Apos, but also with many other Apos. This flattener does not change the focal length of the telescope. Correction for up to full-frame camera sensors (24x36mm) The Explore Scientific Zero X image flattener has been developed due to the rapid development of ever larger camera sensors. With it, there is finally a field flattener available that illuminates and corrects the field of view for full-frame camera sensors up to 24x36 mm. How to use the Zero X field flattener with M48 thread connection This field flattener has a 2 inch (50.8 mm) plug-in connection on the telescope side, with which it is inserted into the telescope instead of an eyepiece or star diagonal mirror. On the camera side, there is a standardised M48 x 0.75 mm connection thread. This M48 connection thread offers a larger free inner diameter than the usual T2 (M42) thread and prevents vignetting when using large camera sensors. With an optionally available and camera-specific adapter ring, a DSLR camera can be connected to it. The working distance is already set at 55 mm. Of course, mirrorless cameras or special astro cameras can also be used with the M48 thread connection. For this, the appropriate M48 spacer sleeves or adapters are additionally required to set the right working distance of 55 mm. This must always be done with every corrector or field flattener so that the best possible field flattening is achieved.Filter thread on telescope side availableThe telescope-side 2.0 inch plug-in sleeve has an M48x0.75 filter thread (internal thread). Individual 2.0 inch colour or nebula filters can be inserted here to increase the contrast of the images.FEATURESField flattener for Explore Scientific ED80, ED102 and ED127 APO telescopesRemoves field curvature from telescopesProduces round stars even at the edge of the image fieldImage sharpness at the edge is drastically increasedA clear benefit for the whole image aestheticsCorrection of field curvature for up to full-frame camera sensors (24x36 mm)Image field flattener without reduction factorOn the telescope side with 2 inch (50.8 mm) plug-in connection and M48x0.75mm filter threadCamera side with large M48 threaded connectorWorking distance of 55 mm between field flattener and camera sensorFor telescopes with a focal length of approx. 480 to 952 mmOptimised for telescopes with focal ratios from F=6.0 to F=7.5Can also be used for various other APOsFully multi-coating on all lens surfacesHousing made of lightweight aluminium, black anodisedAluminium dust cap for M48 threadSCOPE OF DELIVERYZero X field flattener (1 piece)Dust caps

€129.00* €179.00* (27.93% saved)
EXPLORE SCIENTIFIC Teleextender 2x 50,8mm/2"
With teleextenders it is possible to extend the effective focal length of a telescope system, resulting in higher magnification for the observation of the moon, the planets or small Deep-Sky objects with the same eyepieces. So you can use the advantages of eyepieces with longer focal length - such as the bigger eye distance and the more relaxed observing comfort - at high magnifications also.These teleextenders incorporate a telecentric optical design that deliveres a excellent image sharpness over the whole field of view and are premium choices for visual observations and astrophotography. The combination of excellent fully multicoating with superior optical design makes the Focal Extenders superior to classic Barlow lenses.FEATURES: Suitable for visual observations and astrophotographyDoubling the effective total focal length of the telescopeFour lens telecentric design Fully multicoatedFilter thread for color or nebula filtersSCOPE OF DELIVERY: Fokal Extender 2 x Adapter 2" (50,8mm) auf 1,25" (31,7mm)

€185.00*
EXPLORE SCIENTIFIC Telextender 3x 31.7mm/1.25"
With teleextenders it is possible to extend the effective focal length of a telescope system, resulting in higher magnification for the observation of the moon, the planets or small Deep-Sky objects with the same eyepieces. So you can use the advantages of eyepieces with longer focal length - such as the bigger eye distance and the more relaxed observing comfort - at high magnifications also.These teleextenders incorporate a telecentric optical design that deliveres a excellent image sharpness over the whole field of view and are premium choices for visual observations and astrophotography. The combination of excellent fully multicoating with superior optical design makes the Focal Extenders superior to classic Barlow lenses.Features: Suitable for visual observations and astrophotographytripling the effective total focal length of the telescopeFour lens telecentric design Fully multicoatedFilter thread for color or nebula filters

€115.00*
EXPLORE SCIENTIFIC Extension Ring Set M48x0.75 - 5 pieces (30, 20, 15, 10 and 5 mm)
Five extension tubes from 30 to 5mm length with thread connection M48x0,75mm in a set. For adjusting different distances of the camera to the focal plane of the telescope or the corrector/field flattener. There is an M48.0,75 internal and external thread in each individual tube. The M48x0.75 thread is also called large T2 photo thread or 2.0 inch filter thread. Camera specific bayonet adapters or color and nebula filters can be used. Included are 5 different tubes with the steps 30, 20, 15, 10 and 5 mm. The larger free inner diameter of 45.0 mm effectively prevents undesired vignetting of the camera sensor. The outer diameter of the sleeves is exactly 50.65 mm and can therefore be mounted directly in any 2 inch diameter eyepiece adapter. FEATURES Extension sleeves M48x0,75 in set Five extension sleeves: 30, 20, 15, 10, 5 mm Use with correctors and field flatteners Distance adjustment from camera to focal plane Suitable for camera-specific bayonet adapters Also suitable for 2.0 inch colour and nebular filters Internal and external thread M48x0.75 mm (large T2 thread) Large inner diameter of 45.0 mm Outer diameter is 50.65 mm (2 inches) Black matt anodized aluminium Total weight 85 grams SCOPE OF DELIVERY Extension sleeves M48x0.75 (5 pieces)

€55.00*

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EXPLORE SCIENTIFIC 2" Grey- Moonfillter ND-09
The neutral density filter transmits light uniformly across the entire visual spectrum. It serves as an excellent filter to reduce glare and irradiation when observing the Moon with any telescope 4"(10.2cm) and larger. The ND96 filter may also be employed in the splitting of close double stars where one of the binary pair significantly exceeds the other in brightness. Color Filter #ND96 Moon Filter (0.9 density; 13% transmission)

€24.00* €48.00* (50% saved)
EXPLORE SCIENTIFIC 2" UHC Nebula Filter
One of the most important obstacles for the exploration of the night sky is the brightening of the night sky by artificial lights, such as streetlights. The night sky is not really dark in the vicinity of towns or cities, which reduces the visibility of objects beyond the solar system enormously. Depending on the type of the celestial object, it is possible to dramatically increase the contrast by blocking annoying artificial light. The EXPLORE SCIENTIFIC UHC filter "zeros in" on the wavelengths of so-called emission nebulae. Those objects glow in special colours - their emission lines. Those emission lines are linked to chemical elements - in this case hydrogen at 486nm and 656nm, plus oxygen at 496nm and 501nm. The EXPLORE SCIENTIFIC UHC nebula filter blocks all other colour wavelengths (and thereby nearly all of artificial light) and only the emission line of the hydrogen and oxygen can pass the filter. The result is astonishing: suddenly nebulae are visible at locations that were completely invisible from, without filters. In suburban skies, for example the Owl-nebula M97, the Veil-nebula NGC 6992 or even the bright Dumbell-nebula M27 are not clearly visible. Using this filter allows you to see nebulae and their structures in much finer detail. A must for every visual observer. The Explore Scientific nebula filters come with a individual test certificate - your guarantee to receive a premium filter.

€83.00*
EXPLORE SCIENTIFIC Adapter 3" Flattener/Reducer to M48x0.75
This adapter replaces the M42x0.75 Adapter for CCD Camera that comes standard with the EXPLORE SCIENTIFIC 3-inch Field Flattener/0.7x Focal Reducer. Allows the connection of a camera via M48x0.75 thread. The larger free inner diameter than T2/M42 effectively prevents vignetting when using a full format camera. The illumination of the camera sensor is therefore optimised.FEATURESAllows the connection of a camera via M48x0.75 threadLarger free inner diameter than T2/M42No vignetting by using cameras with full frame sensor Fits to EXPLORE SCIENTIFIC 3" Flattener 0.7 x ReducerMade of black anodized aluminumSCOPE OF DELIVERYAdapter with M48x0,75 thread

€36.00*

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VAONIS Hestia Smartphone Telescope Standard Set
Easily turn your smartphone into a smart telescope The Hestia smartphone telescope from VAONIS transforms your smartphone (iOS or Android) into a powerful tool for sky observation. It offers amateur astronomers an easy way to explore the night sky and store impressive images directly on the smartphone. The intuitive app for Android and iOS makes it particularly easy to use. Intuitive app for effortless sky exploration The VAONIS Gravity app (for Android and iOS) helps you precisely align the smartphone telescope. It shows in real-time which celestial bodies are currently visible, provides information on stars, planets, and galaxies, and guides you directly to your desired object. You can also observe the sun (only possible with a sun filter, not included in the standard package) or landscapes. Additionally, the app supports you in creating and sharing your own landscape and astro photos. Astronomy and astrophotography have never been easier - set up the Hestia, place your smartphone in the universal holder, and start exploring the universe! Compact design and easy handling The Hestia smartphone telescope uses your smartphone's camera in combination with high-quality optical lenses to capture the night sky in impressive image quality. Setting up the telescope is straightforward: screw the Hestia onto the included tripod, place your iOS or Android smartphone in the universal holder, launch the VAONIS Gravity app, and align the camera lens. Your smart telescope is now ready for use! The Hestia smartphone telescope is so small and compact that it can be taken anywhere at any time - your take-anywhere telescope! FEATURES Transforms your smartphone into a powerful smart telescope Intuitive app for sky and landscape observation Easy finding of celestial bodies thanks to app support Observation of the sun (only possible with a sun filter, not included in the standard package), Moon, and landscapes possible Compact design and easy handling - quick and ready for use anywhere High-quality optical lenses for impressive image quality Easy setup and intuitive operation SCOPE OF DELIVERY Hestia Smart Telescope Smartphone holder Tripod Instruction manual

€239.79* €299.00* (19.8% saved)
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VAONIS Hestia Smartphone Telescope Premium Set
Turn your smartphone into a smart telescope with ease The Hestia Smartphone Telescope by VAONIS transforms your smartphone (iOS or Android) into a powerful tool for sky observation. It offers amateur astronomers an easy way to explore the night sky and capture stunning images directly on their smartphone. The intuitive app for Android and iOS makes usage particularly simple. Intuitive app for effortless sky exploration The VAONIS Gravity app (for Android and iOS) helps you precisely align the smartphone telescope. It shows in real-time which celestial bodies are visible, provides information on stars, planets, and galaxies, and guides you directly to your target. The app also supports solar (only with a solar filter - included in the premium package) or landscape observation. Additionally, the app helps you create and share your own landscape and astrophotography images. Astronomy and astrophotography have never been easier – set up the Hestia, place your smartphone in the universal holder, and start exploring the universe! Compact design and easy handling The Hestia smartphone telescope uses your smartphone’s camera in combination with high-quality optical lenses to capture the night sky in impressive image quality. The telescope is incredibly easy to set up: mount the Hestia on the supplied tripod, place your iOS or Android smartphone in the universal holder, launch the VAONIS Gravity app, and align the camera lens. Your smart telescope is now ready for use! The Hestia smartphone telescope is so small and compact that it can be taken anywhere – your anytime, anywhere telescope! Premium Package for Safe Transport and Solar Observation The premium package includes an additional hard case for safe transport and a solar filter, allowing for breathtaking images of the sun, including sunspots. This enables you to fully harness the potential of the Hestia Smartphone Telescope! FEATURES Transforms the smartphone into a powerful smart telescope Intuitive app for celestial and landscape observations Easy locating of celestial bodies thanks to app support Observation of the sun, Moon, and landscapes is possible Compact design for easy handling High-quality optical lenses for impressive image quality Easy setup and intuitive operation SCOPE OF DELIVERY Hestia Smart Telescope Smartphone holder TripodSolar finder Solar filter Hard case Instruction manual

€312.39* €389.00* (19.69% saved)