May 23, 2026
Description
Mounting rings and a Bahtinov focusing mask designed for the Samyang 135mm f/2 ED UMC / Rokinon 135mm f/2 lens.
Update June 6th, 2026:
The Bahtinov mask mounts directly onto the lens hood.
A +2 mm clearance is included for foam padding material. I typically use 1.7 mm thick foam tape.
The mounting rings feature an integrated Vixen-style dovetail mount.
The rings also include +2 mm clearance for foam padding.
Hardware Required
4 × M4x5x6 heat-set inserts
6 × M4x10 screws
4 × M4 nuts
For the focuser holder:
2 × M4x5x6 heat-set inserts
4 x M4x8 flat hat screws
300 mm GT2 belt
Designed for astrophotography setups using the Samyang/Rokinon 135mm f/2 lens.
License:
BY-NC
Alex Pasnichenko
