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Hi Joe, I converted my Zeiss 50mm f1.7 Planar T* to PK mount as it was closer to the diameter of the lens than an SA mounting plate.
Extremely difficult conversion too, and was'nt really worth it in the end as I never use the lens anymore because I much prefer my Canon FL 55mm f1.2.
BTW, would you be interested in a Zeiss 85mm f1.4 Planar T* in SA mount? Its near mint, comes with a really great, hard rubber lenshood
and I'll take Â£300 for it. I can throw in the original C/Y mounting plate should you want to convert it back...Its was an extremely easy lens to convert. I'm only selling it because firstly, I have fallen on hard times lately and secondly because I have a faster Canon FD 85mm f1.2 L, also in SA mount.