25-250mm zoom lens 35OPF7-1M/AM (f/3.5, T/4.3) - macro?

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The lens was made at CKBK (aka EKRAN) in 1975 (#750003).Quite weird piece of glass :-)First of all, it has a mount unknown to me. Insertion diameter is 70mm that is bit larger than for OCT-19.So, I can't test it on camera so far, and following though...
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