Free Shipping On Many Items

The Telescope Authority
Since 1947

View Shopping Cart

Your Cart is Empty

Astronomik CLS Light Pollution Filter - 1.25" Mounted

SKU : AK-CLS-1

- Read
  • Free Shipping

  • More on the Way in 14 - 28 Days

Add to Wishlist

52D158B8-B55E-4DF3-8064-D4A13DFFDDC4 Request stock alerts and we'll let you know when the item is back in stock

Got questions? Click for live chat

Product Details

  • The CLS Light Pollution Filter - size 1.25-Inch,  Round by Astronomik:

    The Astronomik CLS is an excellent filter for black and white and color imaging of nebulae, galaxies and star clusters with astronomical instruments of any size. By blocking the spectral lines of mercury and sodium-vapor lamps, and letting the largest part of the visible light and H-alpha emissions pass, the CLS filter will effectively block out most surrounding light pollution, eliminating that annoying orange glare.

    The filters are optimized for use with filter to aperture ratios of 1:3 to 1:15. By remaining within these aperture ratios, aberration and comma are eliminated.

     

    Astronomik CLS Light Pollution Filter - Transmission Information:

    • 92-percent transmission at 486nm (H-beta)
    • 92-percent transmission at 496nm (OIII)
    • 92-percent transmission at 501nm (OIII)
    • 97-percent transmission at 656nm (H-alpha)
    • Pass from 450 to 540nm and beyond 650nm

     

    Features:
    • Parfocal with other Astronomik filters
    • Glass thickness: 1mm
    • Highly resistant against high humidity, scratches and aging effects
    • Diffraction limited, the filter will not reduce the optical performance of your telescope!
    • Astronomik filters are delivered in a high-quality, long lasting, filter box

     

    OPT Product Number: AK-CLS-1 

     

  • specifications

    Filter TypeLight Pollution/City Light Suppression
    Free ShippingYes
    Peak Transmission97% at H alpha
    ShapeRound
    Warranty10 Year Warranty

Product Reviews

Customer Reviews
5.0 Based on 2 Reviews
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
    MC
    04/29/2020
    Marcelo C.
    United States United States
    Great filter

    This filter has excellent transmission on the wavelengths that are needed for Astro Photography and good light pollution suppression. I’ve been able to imaging galaxies with relatively low exposure time in bortle 8 sky

    GR
    04/16/2019
    Gilbert R.
    United States
    visual filters

    wanting to see DSO's better. The people at OPT were helpful in explaining the difference and use of visual and imaging filters. service was prompt.