This is the F9 variant with 2 + 2 glass. There is quite a lot of discussion here about the series VII (a) protars - but little about this semi-wide competitor to Goertz's series III. I have gotten hold of a 150mm and a 172mm series IIIa F9 anastigmat (pre-protar labeling with 4 and 5 digit serial numbers). Does anyone here have any experience with coverage and performance (and etc.) of these? They should be OK for 4x5 and 5x7, respectively. These were the days when Zeiss still stamped serial numbers on flanges as well as the lens rims!
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