Svbony CLS clip EOS-C Filter Review
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SVBONY CLS 1.25″ Deep Sky Filter for Astronomy Monocular Telescope Eyepiece Cut Light Pollution Visual & Astronomical
The SVBONY City Light Suppression broadband filter is designed to improve the visibility of various Deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photographic purpose at sub-rural area.
Features:
1.Multi-layers anti-reflection coating
2.Non-cementing optical substrate coating
3.Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching
4.Stability on CWL (central wavelength) no deviation affected by temperature change
5.For planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.
6.Ultra-thin filter cell minimize vignetting by maximize possible
7.Aerometal Material Precise CNC Machining Sand Blasting,process Black Anodized Finish Extinction Treatment to Prevent Reflection Laser Engraving No Fading
8.90% transmission of main nebula emission lines (i.e. Ha 656nm, OIII 496nm&500nm, SII672nm and H-beta 486nm).
9.0.1% transmission of off-band, specifically the major emission lines of artificial light pollution
10.Suitable for color CCD cameras and unmodified DSLRs
11.CLS with wider pass-band than UHC and hence is more favored when observing under mild to moderate light pollution.
12.Light pollution filter do not eliminate the effects of light pollution or increase the object ‘ s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.
Multi-coated Glass with an lon-assisted Deposition Technology/Standard 1.25 inch/M28.5*0.6
The effect of using CLS filter
How to use it?
How this filter works
The CLS has a wider pass-band than a narrower UHC filter, so it gives a more natural colour response than a UHC filter. CLS is therefore best for mild to moderate light pollution filter for suburban skies.
Artificial lighting such as mercury vapour lamps, both high & low pressure sodium vapour lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow) are almost completely suppressed by the SVBONY CLS filter.
The filter selectively allows light from deepsky objects through, with high transmission of ionised oxygen O-III (496nm & 500nm), Hydrogen Beta / N-beta (486nm), N-II(654nm and 658nm), H-alpha(656nm) and S-II(672nm).
By selectively blocking light pollution and transmitting these desirable wavelengths, the contrast and detail of deepsky objects is greatly enhanced.
Note
Question:Will this work with my celestron travelscope 70?
Answer:It will work on anything with removable eye pieces that are 1.25″ internal fine thread. They thread into the eyepiece, not the scope.
Question:Can this be used to see the eclipse?
Answer:No you would blind yourself using this filter to view an eclipse. You need a dedicated sun filter that fits over the telescope lens, not the eyepiece. Sun filters reject something like 99.9999% of the sunlight before it enters the telescope.
Question:Would the 1.25 or 2 inches work for my celestron nexstar 127slt mak computerized telescope (black)?
Answer:I would think either of the 1.25″ or the 2″ CLS filter would work fine for your particular telescope. As long as you have an interchangeable adapter, for either or both, the 1.25″ or 2″ filter, it works just fine.
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