Hi,
when searching through previous threads looking for information about the Xenar 3.5/15 cm lens, I found postings referring to Tessar formula and something called Type-D.
Could someone please explain what Type-D is and if all Xenar 3.5/15cm are Type-D or if there are variations...such as when did they start/stop being Type-Ds.
I recently bought one made in the mid 1940's and is hoping to use it for nice 'old looking' portraits.
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