This is a question for all you lens experts. I have obtained a Goerz lens via eBay that was supposed to be a "Red Dot Artar". The seller did say that he was sure it was a "red dot", but could not verify th is. Well, being one to never resist an oldie, I purchased it. However, it does not conform to what a 210mm "red dot" should be.
There are no markings on this lens other than "C.P. Goerz Am Opt Co" and the ser ial number. It is an f/6.8 lens. Red dots are f/9.0 - however both the Gold Ring Dagor and G old Dot Dagor (240mm) are f/6.8
I suspect that it is in reality one of the "golds", but cannot verify this. Is t here another way to identify this lens, like by serial # ? I have found some history on Goerz lenses on this site and others, but nothing t hat is any help. Any suggestions or tips?
Many thanks.
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