Bahtinov Mask for Canon RF 100-500 Telephoto Lens

This lens cap with a Bhatinov Mask makes it easy for astrophotographers to manually focus on stars. The STL is designed to fit a Canon RF 100-500 telephoto lens, but the OpenSCAD file can be easily tailored to accommodate lenses with different dimensions.  The OpenSCAD file is derived from Dakloifarwa's files published at:

https://github.com/dakloifarwa/Bahtinov-Mask-For-Samyang-135mm-Lens