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Use it whenever a device in your optical train terminates in a male T-thread — a filter selector
You can see the increase in contrast in the sequence of equal-exposure images of the Crescent Nebula (NGC 6888) taken on the same system and on the same night
The front of your telescope radiates heat directly into the cold night sky
Lumicon 2" diameter × 1.5" length — Drop-In Eyepiece Extension Tube Visual Adapter cm{flex:0 0 44%Lumicon 2" Drop In Extension Adds 1. 5" of back focus so your eyepiece or camera can reach sharp focus. The Lumicon 2" diameter 1. 5" length Drop In Eyepiece Extension Tube drops into a 2" focuser or diagonal and accepts a 2" eyepiece on top, pushing the eyepiece back by roughly 1. 5". The larger 2" clear aperture suits wide field eyepieces and large sensor imaging, where it reduces vignetting compared with a 1. 25" light path. Specifications Barrel
