Finder to Guide Scope Modification
prusaprinters
The adapter fits on a TS Optics 8x50 mm finder scope with 180 mm focal length (https://www.astroshop.eu/optical-finders/ts-optics-finder-8x50) but can probably be modded for other finder scopes as well. You can determine the focal length of your finder scope by Autocollimation using a mirror placed in front of the scope and your phone light shining through a sheet of paper with text on it. The position of the sheet where you can see a sharp projection of the text matches the focal plane.
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