CLS Light Pollution Reduction Filter for Observation of Deep-Sky The City Light Suppression broadband filter is designed to improve the visibility of various deep sky objects. City Light Suppression Broadband Filter SVBONY city light suppression broadband filter is designed to improve the visibility of various deep sky objects, by selectively reducing the transmission of wavelengths of light pollutants. specifically those produced, by artificial lighting including mercury vapor lamps; both high and low pressure sodium, vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere, such as sky glow. Extinction Treatment: aerometal material precise CNC machining sand blasting process black anodized finish extinction treatment to prevent reflection laser. Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and optical density of off-band. Ultra-thin filter cell minimize vignetting by possible. 90% transmission of main nebula emission lines (i.e. Ha 656nm, OIII 496nm&500nm, SII672nm and H-beta 486nm). 0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nmand 578nm). Compatible with color CCD cameras and unmodified DSLRs. CLS filter: engraving no fading CLS with wider pass-band than UHC and hence is more favored when observing under mild to moderate light pollution. 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. Warning: the filters of SVBONY are not designed for sun observation, don not look directly into the sun with SVBONY filter, otherwise it will burn the eyes. City Light Suppression Broadband Filter Deep sky observation 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; CLS filter is suitable for enhancing the contrast and getting more details for both visual and photographic purpose at sub-rural area. Previous page Next page 1 Coating 2 Aluminum Frame 3 optical glass lens 4 Sturdy Plastic Case Suitable for all 1.25 inch telescope eyepieces Specifications Type: City Light Suppression Filter (CLS Filter) Material: Optical glass lens, Aluminum Frame Shape: Round Barrel diameter: 1.25'' Thread: Standard M28.5*0.6mm Net Weight: 5.2g / 0.18oz Glass Thickness: 1.85mm Telescope & telescope camera SV550 APO telescope Add to Cart SV503 80ED telescope Add to Cart SV503 70ED telescope Add to Cart SV48P telescope Add to Cart SV405CC telescope camera Add to Cart SV605CC telescope camera Add to Cart SV505C telescope camera Buying Options Customer Reviews 4.6 out of 5 stars 32 4.7 out of 5 stars 290 4.7 out of 5 stars 290 4.4 out of 5 stars 77 3.9 out of 5 stars 20 3.6 out of 5 stars 11 3.9 out of 5 stars 14 Price $659.99$659.99 $399.99$399.99 $369.99$369.99 $299.99$299.99 $649.99$649.99 $588.99$588.99 — Applicable scene Astrophotography & Visual Astrophotography & Visual Astrophotography & Visual Astrophotography & Visual Deep sky photography Deep sky photography Planetary photography Lens Coated triplet apochromatic optics Ultra-wideband coating Ultra-wideband coating FMC Glass Lens AR coated AR coated AR coated Feature 1 2.5in dual speed focuser(1:10) 2-in dual speed focuser(1:10) 2-in dual speed focuser(1:10) 2-in dual speed focuser(1:10) IMX294 CMOS sensor IMX533 CMOS sensor IMX464 CMOS sensor Feature 2 F/6 focal ratio F/7 focal ratio F/6 focal ratio F/5.5 focal ratio 19FPS 20FPS 93FPS Feature 3 2 inches adaptor 1.25-2 inches adaptor 1.25-2 inches adaptor 1.25-2 inches adaptor 1.25-2 inches adaptor 1.25-2 inches adaptor 1.25-2 inches adaptor
