Lens cover for Opteka 6.5mm fisheye lens hood.
thingiverse
Got an Opteka 6.5mm f/3.5 without removable hood, that lacked a lens cover. So a very short time in OpenSCAD and some time on the printer. Really as simple as possible! It works great. It's a friction fit, so some people may need to adjust the sizes, or prefer a thicker wall. Since I do Astrophotography, I printed mine in glow in the dark. May or may not fit the Rokinon 8mm, and similar fisheye lenses. The dimension are in OpenSCAD, but it's a 75mm OD of the lens hood, and 25mm long. (Note that looking at the dimensions, it won't work with https://www.thingiverse.com/thing:3714861 If you need a cap for that, go into customizer, and make one based on the 77.4mm OD )
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