Celestron UHC / LPR Filter
Celestron Ultra High Contrast Light Pollution Reduction Filters (UHC/LPR Filters) are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). Celestron UHC/LPR Filters: Celesteon UHC/LPR Filter 1.25" (item 94123) Celestron UHC/LPR Filter 2" ( model 94124) The new Celesteon UHC / LPR Filter has improved contrast over the typical broadband filters....