This is a completely rewritten version of the Bahtinov mask (originally by Ryoko / brentb) which is modified for the great Samyang 135mm F/2 lens. This Mask features a pretty narrow pattern (0.8mm) for a large diffraction pattern.
The inside diameter of this filter is 94mm
See the three focus screenshots for the working principle:
Left: intrafocal, Middle: focal, Right: extrafocal
* 3D Printed from a smooth, high finish composite
* Available in matte black
* Bahtinov Mask For Samyang 135mm Lens bydakloifarwa
* Thingiverse Thing:2168672