EXPLORE SCIENTIFIC 2" CLS Nebula Filter
The Explore Scientific CLS filter allows the precise observation of fainter deep sky targets
- High-quality Explore Scientific CLS filter
- Only transmits certain emission lines
- Absorbs almost all artificial light
€57.00*
% €83.00* (31.33% saved)Available, delivery time: 1-3 days
Product number:
0310220
GTIN/EAN:
4007922000084
Product information "EXPLORE SCIENTIFIC 2" CLS Nebula Filter"
Besides air turbulence, the brightening of the night sky is the biggest obstacle to observing faint objects beyond the solar system. Street lamps and other artificial lighting mean that the sky in human settlements is no longer really black. This affects the contrast and thus the perception of deep-sky objects. Depending on the type of celestial object, however, part of disturbing artificial light can be filtered out, making it easier to observe fainter targets.
The EXPLORE SCIENTIFIC CITY LIGHT SUPRESSION - or CLS - filter uses the fact that the artificial lighting is not evenly distributed over the entire spectrum. These colours - in the case of the EXPLORE SCIENTIFIC CLS nebula filter, above all the typical colours of mercury and high-pressure lamps, used in street lighting - are suppressed, but the emissions of deep-sky objects are allowed through. With a slightly brightened sky, some relatively bright deep-sky objects are practically invisible with a telescope, for example the large galaxy M101. Using this filter makes observation much easier. A must have for any visual amateur astronomer. The CLS can also be used as a useful photographic filter - helping to improve the quality of your telescopic deep sky photos.
The EXPLORE SCIENTIFIC nebula filters are delivered with an individual test report - so you can be sure of receiving high-quality filters.
SPECIFICATIONS:
- eliminates disturbing light - e.g. from street lighting
- enables observation of faint deep sky objects
WHAT'S INCLUDED:
- 1x nebula filter
| Colour: | black |
|---|---|
| Field of application [Telescope-filter]: | Filter for Deep-Sky Observing and Astrophotography |
| Material: | Glass, Plastic |
| Telescope filter type: | Nebula Filter |
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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
EXPLORE SCIENTIFIC 1.25" UHC Nebula Filter
€59.00*
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 systems enormously. Depending on the type of the celestial object it is possible to increase the contrast dramatically by blocking the annoying artificial light. The EXPLORE SCIENTIFIC UHC filter uses a characteristic property of the 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 colours (and thereby nearly all of the 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 empty without filters. In suburban skies for example the Owl-nebula M97, the Veil-nebula NGC6992 or even the bright Dumbell-nebula M27 are not clearly visible. By using this filter you can see the nebulae and their structures without problems. A must for every visual observer.
The EXPLORE SCIENTIFIC nebula filters come with a individual test certificate - your guarantee to receive a premium filter.FEATURESenables the observation of emission nebulaeblocks almost the entire artificial lightonly the two emission lines of hydrogen and oxygen passes the filterWHAT'S INCLUDED1x 1.25" UHC nebula filter