Rokinon 14mm threaded filter adaptor.

thingiverse

IMPORTANT: This adaptor will ONLY work if you are using a camera body with an aps-c or "cropped" sensor. This will not work on full frame sensors as the adaptor ring will appear in the field of view, I have tried it on a full frame and you get a black circle covering 20% of your photos. This is a filter adaptor ring for the Rokinon/Samyang 14mm ultra wide angle lens. This adaptor allows you to use 95mm threaded filters like a circular polarizing filter, Neutral density filter, or other types of filters on this fixed hood lens. There are no threads on this STL model. A 95mm UV filter is pressed into the top of the adaptor ring. The UV filter acts as the master threads to screw other filters to. Printing instructions: -I printed this in black Makergeeks Raptor PLA at 245ºC since it is a high temp PLA that can resist the heat of being left in a car or other hot environments. -Use black or extremely opaque filament, you don't want any light entering through the sides of the print. -Use 4 shells to strengthen the thin feature at the top. -No supports: all angles are at 45º -Use a thicker layer height like .2mm. This create ridges on the inside of the adaptor that help trap and deflect light, it keeps light from bouncing off the inside of the UV filter and creating glare. Other things you will need: 95mm UV filter. I designed this around a ProOPTIC 95mm UV filter to give a nice snug fit, so consider any other brand UV filter untested. Other brands may have a slightly different outer diameter of the filter ring and my not fit with the adaptor I made. I have the ProOPTIC 95mm filter kit that comes with a UV, circular polarizing, and ND filters. It's a great kit at a good price. You can find it on Amazon and Adoroma Assembly instructions: Gently press the 95mm UV filter into the top flange of the adaptor ring with the female threads facing out. Then slide the adaptor ring over the fixed lens hood of the lens. Slide the adaptor down until the lens hood makes contact with the UV filter. The UV filter should rest directly on the lens hood of the lens as shown in the second picture. It is an overall simple design so it would be very easy for you to make up a new model in Fusion360 to fit your own needs if you want to try and adapt another filter ring diameter.