SVBony

Used SvBONY CLS Filter (Light Pollution) 1.25"

SKU: U2403-FN-SVB-CLS


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  • $19.95
  • Regular price $29.95

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Not Returnable Please note that used items are not returnable.

This is a CLS filter for light pollution.  It is in very good condition, clean, with only a tiny amount of dust that will not affect your views.  We do not have any box for this.    

      

     

    • Evaporation with Ion assisted deposition coating technology for durability and resistance to scratching;as well as stability on CWL (central wavelength) no deviation affected by temperature change
    • Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off band
    • 90% transmission of main nebula emission lines;such as 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;such as Na 589nm;Hg 435nm and 578nm
    • Suitable for color CCD cameras and unmodified DSLR Urban optical filter can effectively suppress urban harmful light and improve the contrast of shooting target

     

     

    CLS Light Pollution Reduction Filter for Observation of Deep-Sky

    Telescope Filter  1.25 inches CLS Filter

    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.

    Telescope Filter
    Astronomical Photography

    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
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