Celestron UHC/LPR Filter - 1.25" Round Mounted - 94123 Binocular Microscopes The slot you see on

The slot you see on the top of the TeleVue 4" Ring Mount allows you to attach Televue accessories like the Starbeam

By aggressively filtering out the defocused blue wavelengths

and while there are some differences

Kowa Product Number: TSN-82SV

Adds twenty-two additional pounds

Celestron UHC/LPR Filter - 1.25" Round Mounted - 94123 Binocular Microscopes The slot you see onAbout the Celestron UHC LPR Filter 1. 25" The Celestron Ultra High Contrast Light Pollution Reduction Filter is 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). The Celestron UHC LPR Filter has