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aus Jena Tessar lubrication
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PostPosted: Fri Nov 19, 2021 1:29 pm    Post subject: aus Jena Tessar lubrication Reply with quote

I got one that has stiff focus in the middle, else too loose.

Is this because of helicoid or is it some goo in the parts that keep helicoid in the right place. I don't want to disassembly the whole lens but get the focus little better. Can one do it from behind?

PostPosted: Fri Nov 19, 2021 8:28 pm    Post subject: Reply with quote

Thanks for topic...my Flektogon has same issue. Wondering if due to hardened grease or helicoid wear. Since lens is practically unused I'm leaning toward former cause.