Helical Focuser Adapter, Dust Covers, 114mm Newtonian Telescope

A double-helical focuser adapter for a 114mm f/3.9 Newtonian telescope such as the Celestron Cometron 114mm, Orion StarBlast 4.5, or equivalent. These telescopes typically come with a plastic rack and pinion focuser that is very short, has no T threads for astrophotography, and is difficult to find an aftermarket replacement for.

Some 1.25" double-helical focusers are too tall and don't provide enough backfocus for this application even after shifting the main mirror forward. This adapter fit