Optolong Clear Sky Camera Filter

  • Optolong Clear Sky filter blocks city light pollution to improve contrast
  • Threads to the front of your camera lens
  • Choose your filter thread size: 77mm or 82mm



  • Sale
  • Regular price $165.00
  • $165.00
  • You save: $0.00 (0%)

In Stock
Free Shipping
Add to Wishlist
Already have gear? Trade it in for cash or new equipment.

Accessories Added

OPT Telescope Expert

Want Help?

Ask Our Telescope Experts


Optolong Clear Sky Camera Filter

A Clear Sky Filter from Optolong Optics Co,.Ltd!

This is a front facing 77 or 82 mm, no dark-corner filter. The CSF blocks the city Na and Hg light pollution to improve contrast effectively. The main point of this filter that differs with other light pollution filters, is its front facing, 77 or 82 mm, you can twist it into the front of your camera's lens directly like a UV lens.

The performance of this filter reveals no wavelength shifting resulting in no color gradients through the images.

This filter is well suited for use with any lens where a UV lens is recommended.

Optolong Clear Sky Camera Filter

The images above are from the famous astrophotographer Vincent Cheng of Hong Kong, taken on January 9th.2017.

  • The left image was taken without a filter
  • The middle image was taken with Optolong Clear Sky Filter single JPEG frame.
  • The right image was taken with Optolong's Clear Sky Filter, 62 frames stacked.



Filter Thickness1mm
Filter TypeLight Pollution/City Light Suppression
Free ShippingYes