Re: 180 3.4 Apo vs 180 2.8 2nd version
The transition from filters series 7.5 to E60 (with different coating of the front glass element) in somewere in between s.n. 2.8XX.XXX and 3.0XX.XXX; can't be more accurate, sorry for that. May be some other forum member remembers better.
Fernando.
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