Bahtinov Mask For Samyang 135mm Lens

This is a completely rewritten version of my Bahtinov mask (originally by Ryoko / brentb) which I had modified for the great Samyang 135mm F/2 lens some time ago. I implemented a pretty narrow pattern (0.8mm) for a large diffraction pattern.
See the three focus screenshots for the working principle:
Left: intrafocal, Middle: focal, Right: extrafocal

The project's source code is also hosted at Github:
https://github.com/dakloifarwa/Bahtinov-Mask-For-Samyang-135mm-Lens

Version 2.5: added a little hole for a hand strap