Originally Posted by
Emmanuel BIGLER
I own an interesting example of a relatively modern lens (designed at end of the 1950s) where the "black circle" starts before any loss of sharpness can be seen, it is the Zeiss Planar 2.8-100 [the model for the Baby 6x9 Linhof Technka, not the Hasselblad's] for which there exist a kind of a "built-in rear lens hood". This device that I have not seen in other view camera lenses is installed behind the lens to cut-off abruptly light rays beyond a nominal image circle considered sufficient to cover the 6x9 cm [2x3"] format with some (small) amount of shift or rise.
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