Collimation Cap for 1.25" optical tube.

Collimation Cap for 1.25" optical tube.

thingiverse

This is a collimation cap for a 1.25" optical tube on a reflector telescope. (If you're looking for this, you probably know how to use it already :¬) Glue a shiny washer (ideally 25mm) centrally to the inside of the cap.

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