Duncan Mask for telescope collimation by jggall01 3d model
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Duncan Mask for telescope collimation by jggall01

Duncan Mask for telescope collimation by jggall01

by Thingiverse
Last crawled date: 3 years ago
Edit the OpenSCAD file for the dimensions of your particular telescope, and print your own customized Duncan Mask. This mask makes collimation of SCT scopes more straightforward. Should work on other types of scopes, too, but untested by me.
This design incorporates a "handle" that surrounds the secondary retainer. If find that this helps me to put the mask on and off without getting any fingerprints on the corrector plate.

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