Celestron Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury, and both high and low pressure sodium vapor lights. In addition, they block unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). This unit is in an adapter for mounting directly to your Celestron or Meade SCT back for contrast enhancement. $88 + s/h list pricing, my price is $72 shipped by ground anywhere in the CONUS. I'm cleaning house, and the unused are finding new homes.
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