My moving flexible ring idea does not depend on glass to glass contact to move the last element, a bottom lip of my "EdTraveller" matches up to the thin metal ring around the moving lens group. I feel I will be able to keep perpendicularity within acceptable levels and there will be no risk of the rear lens element popping out either. Right now my biggest problem is the materials like nylon and Devron we have been experimenting with are too rigid and fragile. We have ordered 2" diameter cylinders of polypropylene type materials that should be arriving tomorrow but my father-in-law is concerned that the softer material will be harder to machine since it distorts more and has a tendency to hang on to the cutting chips which will make it hard to get a good finish.
The 5D3 mirror is slightly lower profile than the 5D2 mirror thankfully. The base FD 55mm 1.2 SSC without separate rear lens almost makes it to infinity before lens to mirror contact where the 5D2 hits at just before 10 meters, since I can keep the separate rear lens of the Aspherical a hair closer to the focusing set, I can get infinity focus with the Aspherical on the 5D3 without mirror contact. Since I expect many serious enthusiasts interested in manual lenses worldwide will be using the 5D2 for years I have to design with that camera firmly in mind.
Yeah Marcus, that 85L is a real beast to get that lever out eh. I'm going to do a (probably very long) video of me (trying) to put it together again in original condition. I need to do this in order to make the instructional video of how to do the conversion using my kit. Similar to the ones I did here for the FD 55 1.2 http://www.youtube.com/watch?v=HT20ozVh8Y0 the TS 35 2.8, http://www.youtube.com/watch?v=_--po9ppBdY, the FL 55 1.2, http://www.youtube.com/watch?v=dDhG0CWAJY0 and how to do the focus calibrations on the super telephoto lenses using my low profile 0.75 and 0.5mm FD-EOS adapters http://www.youtube.com/watch?v=Ytgt1d1Ts8I
Also, FDn lenses that I think will be great on EOS
7.5/5.6, 14/2.8L, 15/2.8, 24/1.4L/2, 28/2, 35/2, 50/3.5macro/1.4/1.2/1.2L, 85 SF/1.8/1.2L, 100/2/2.8macro, 135/2, 200/2.8/4macro, 300/4/4L
85-300, 50-300L, 20-35L, 80-200L
Of course all the white super telephotos already work on EOS with my 0.5mm adapter and can go back to FD film in seconds. A permanent lens mount swap is impractical because removal of the pivot mounted aperture lever is challenging.
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