Schneider states an image circle of 155mm at f=16, and the 140mm wide image needs about 150mm. The image circle is indeed covered even wide open at f=8 (if you can call it that). The truth however is, that the vignetting is awfull and forces you stop down a lot.
I also have a number of not suitable 50s (i.e. what is left of them) in the drawer...
Regards,
Sven

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