Summary

Astronomy right angle adapter for bigger binoculars (15x70 20x80) or similar types

Componets:
2x Seagull Right Angle Finder or similar types
6x M3 screw

Note:
First, print the test ring to select the version according to the size of your eyepiece [A or B]. Version B is optimized for the Celestron 15x70 binocular.

Use a tap to create a M3 thread

FreeCAD source on GitHub