Samyang 135mm Lens Collar

Summary

Since lens collars for the Samyang/Rokinon 135mm f/2 lens are hard to come by I decided to look down the 3D printing route.

I found a really clean looking design by SleeplessLights but didn't want the hassle of adding inserts, so I remixed it to use regular nuts instead. The screws I used have a countersink head so I also accommodated this.

I also removed the attachment points on the sides as I don't plan to add anything to it except maybe a guide scope on top (I will redesign the top plate if I ever bother to do this)

The only hardware required now are;

2x M4 x 12mm bolts + nuts (for the hinges on the rings)
4x M4 x 12mm bolts + nuts (for mounting the top plate)
2x M4 x 20mm bolts + nuts (for clamping the rings closed)
4x M5 x 20mm bolts + nuts (for mounting the bottom plate)
1mm thick single sided foam tape or similar to go on the inside of the rings (They are slightly oversized)

Back in January I bought a guide scope and finder shoe (specifically the "Astro Essentials Finder Shoe" https://www.firstlightoptics.com/finders/astro-essentials-finder-shoe.html)

I redesigned the top plate to allow the attachment of the finder shoe, some post processing will be needed to create a snug fit.

I have also added a STEP file which includes all of the parts, including both top plates.

Notes:                     

I would recommend a 0.4mm nozzle and 0.12 layer height for at least the bottom of the rings as the hole for the nut on the hinge can print weird if printed at bigger layer heights.

I used CHEPs Cura Profiles.

Post-Printing

May require some minor sanding especially around the hinges in order for it to fit together properly.

If using the Guide Scope top plate with recommended finder shoe, some sanding will be required to create a snug fit.