Lens cover for Opteka 6.5mm fisheye lens hood.
thingiverse
I have an Opteka 6.5mm f/3.5 lens without a removable hood, which came with no lens cover. Using OpenSCAD briefly and the printer for a bit, I created something simple that works great. The design is a friction fit, so you might need to adjust the sizes or prefer a thicker wall depending on your needs. As an astrophotographer, I printed mine in glow-in-the-dark material. The lens hood cap may not fit Rokinon 8mm and similar fisheye lenses perfectly. You can see the dimensions in OpenSCAD, but it's designed to be 75mm OD with a length of 25mm. If you're using a different lens like the one on https://www.thingiverse.com/thing:3714861, note that this design won't work for you. To create a cap for that specific lens, go into the customizer and make adjustments based on the 77.4mm OD.
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