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Any help on opening Sonnar 85 2.8 MMJ to fix stiff focus


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Hi, I realise this is a bit off topic, but if you have any tips on getting into this lens the Zeiss Sonnar 85 2.8 MMJ version, it would be greatly appreciated. I have torn down a CY 50 1.7 AEJ and relubed the helicoid, done the Leitax mount adaption on my other CY lenses, and so feel reasonably confident. There's not a lot on other forums I've trawled. I don't need to do the aperture, just want to clean and relube the helicoid, hoping I can do this from the front and leave the aperture alone. Thanks

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