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Zeiss Opton 85mm f4 Contax IIa/IIIa lens disassembly


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Wondering if any members have experience disassembling this lens? Two aperture blades are out of position and I would like to pull the barrel apart to clean and lube the helicoid while I am repairing the blade issue. I have the front ring out, the front two elements out, the lens mount and rear element out. Its down to the barrel and the aperture assembly but I can't see how to remove anything else. Its a later version of the lens; a red "T" version. Any thoughts?
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As Emily Littella from SNL used to say; "Never Mind"! I found a way to fix the aperture blades without disassembling the barrel and in heating up the lens (without optics), the helicoid is now working fine. At some point though, I would like to get back in to do the job right so any help would still be appreciated although the urgency is way down.
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