After my somewhat successful Frankelens #1 I wanted a slightly easier lens to hack. I decided on the rangefinder film camera Ricoh 35ZF with a fixed Rikenon 40mm f2.8 The transplant was to be much easier than from a camera that has auto focus, the Rikenon is a self contained manual lens with focus helicoid and aperture. ricoh0115 by kris, on Flickr Disassembling the camera and removing the lens was relatively easy; the lens is mounted on a board. Lens assembly_c by gnarlydog, on Flickr I removed the board. On the rear of the lens I found the shutter mechanism. Separating shutter mechanism_c by gnarlydog, on Flickr There is no need to keep the shutter cogs and levers which could hinder possibly the install of an adapter. I removed the unnecessary bits. Shutter cogs_c by gnarlydog, on Flickr Shutter removed_c by gnarlydog, on Flickr Once the lens was stripped of the superfluous material I used a 52mm UV filter ring (glass removed) to create a collar around the base of the original lens as it looked a bit raw. The lens needed to be spaced about 7.5mm further away from a C-mount adapter; I created that distance by stacking two 46mm UV filter rings (glass removed) and a bit of shaving (sandpaper on a flat surface, ring sanded in circular motions, keeping it even). The 46mm fitted perfectly around the base of the lens while the 52 slipped over (with just a bit of enlargement of the bore) Rikenon 40mm adapter to M43_c by gnarlydog, on Flickr After checking that I had perfect infinity (many trials while slowly sanding away the ring) I glued the rings with epoxy (JB Weld) making sure that the 52mm would be attached to the aperture ring, while the 46mm just to back (base) of the lens. The shutter no longer serves a purpose so I covered the marking on the lens with high grade decal. Rikenon 40mm on E-P5_side_c by gnarlydog, on Flickr Rikenon 40mm on E-P5_c by gnarlydog, on Flickr Sample images to follow soon.