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I have a Zeiss 85mm f1.2 (50th anniversary) lens which originally had a Contax/Yashica mount. When I bought the lens it came with an Aaton mount. I want to install an EF conversion mount which I bought from Simmod, but it requires the original C/Y mount to be present, in order for it to attach to and I guess sit at the right height for flange distance etc. I've tinkered with making a shim/spacer out of a Canon lens cap, but it's not exactly as good as a nice machined metal part. And it requires me to find longer screws.. Anyway, my questions would be: 1) What is the correct distance from rear element of this lens to sensor/film plane? 2) Is there a way to source a C/Y mount for this particular lens? (Note it's quite a bit wider at the base than many potential "donor" contax lenses, I know because I've already destroyed a 50mm f1.7 *sorry) 3) Do spec sheets, blueprints, technical data or papers exist in a public domain for this particular lens? 4) Could someone please point me in the direction of a good resource for understanding how the C/Y mechanism works? I seem to have begun my lens *home servicing journey on a rather expensive lens, and I'm pulling a few too many hairs out with anxiety... Many thanks and hello!

All fully serviced by a qualified technician and all are carefully film tested by myself. Smooth operation, excellent cosmetic condition and crystal clear lenses. Braun Nizo 6080 Matte Box Kit - £299.99 GB Pounds Minolta Autopak-8 D6 - £79.99 GBP Yashica Electro 8 LD-4 - £59.99 GBP Canon 514XL-S with C-8 Wide Lens - £99.99 GBP Payments accepted via PayPal and shipping prices are not included (charged at actual cost). Please just contact me for all the details. Bill :)