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OPTOLONG 1.25" City Light Suppression CLS Broadband Filter for Observed Visually Nebula Night Sky

Product Description

OPTOLONG CLS filter is broadband filter with an obvious effect on blocking city harmful lights. CLS filter blocks lights selectively, especially the mercury and sodium light from man-made lamps and the skyglow in nature. CLS filter lets the light from nebula highly transmit, it has a high transmittance at the region of OIII (496nm & 500nm), Hß (486nm), NII (654nm &658nm), Ha (656nm) and SII (672nm).

Features:

  • Multi-layers anti-reflection coating
  • Non-cementing optical substrate coating
  • Electron-beam gun 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.
  • Ultra-thin filter cell minimize vignetting by maximize possible
  • Aerometal Material Precise CNC Machining Sand Blasting
  • Process Black Anodized Finish Extinction Treatment to
  • Prevent Reflection Laser Engraving No Fading
  • 95% transmission of main nebula emission lines (i.e. Ha 656nm, OIII 496nm&500nm, SII672nm and H-beta 486nm).
  • CLS with wider pass-band than UHC and hence is more favored when observing under mild to moderate light pollution.
  • Note: 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.

Package Includes

  • 1.25" OPTOLONG CLS Filter

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A:Overseas Warehouse Local Dispatch

  • From US Local Dispatch: USA: 2-6 business days , other countries: 5-14 business days.
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  • From DE Local Dispatch: Deutschland: 1-3 business days , other countries: 2-5 business days.
  • From AU Local Dispatch: AU:2-6 business days.

B: China Domestic Dispatch

  1. CountryDelivery TimeWorking Days(not including holiday)5-78-1112-1415-1920-22>22Working Days+Saturday+Sunday5-910-1516-2021-2526-30>31United KingdomRate(item arrived)9.9%63.2%19.1%3.4%4.4%RefundAustraliaRate(item arrived)21.4%50%14.3%7.2%7.1%RefundFranceRate(item arrived)10.5%28.6%43.8%10.1%7%RefundGermanyRate(item arrived)11.1%22.2%30.3%20.9%15.5%RefundCanadaRate(item arrived)0%47.1%31.4%17.6%3.9%RefundSpainRate(item arrived)3.5%25%47.9%12.9%10.7%Refund
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    Feedback

    PushAuction

    On May-17-18 at 02:19:27 PDT, seller added the following information:

    DataCaciques

    Filed under: Eyepieces & Accessories