This is an insert to the lens hood of the Samyang 135mm F/2 to stop it down to F/2.8 without using the internal (bladed) diaphragm, to prevent diffraction spikes on stars.
Samyang_aperture_28.scad | 425.0B | |
Samyang_aperture_28.step | 20.8KB | |
Samyang_aperture_28.stl | 269.6KB |