I read a lot of the information about APO-Sironar lenses but never about Sironar . I can buy a mint looking sironar 210/5.6. It looks coated though. Is this a go od lens? I don't think I can compare the lens with an APO-Sironar, but what are exactly the differences between them. The serienr is 9 259488. Should I buy it f or $300?
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