Product Details

• Description
• Specifications
• Included Items
• Reviews

• 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.

  

  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.

   

• specifications

  Bandpass	Broadband
  Filter Thickness	1mm
  Filter Type	Light Pollution/City Light Suppression
  Free Shipping	Yes
  Shape	Round
  Size	2"

• included items

  • 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