I am contemplating fixing up a 5X7 back for adapting to my 8X10 camera...motivated by the high cost of 8X10 film. I am wondering if my Caltar S-II 150mm f/5.6 (left over from my 4X5 days) will cover 5X7 format. I have googled but am having trouble translating the numbers - 70 degrees of coverage and 210mm image circle is what I have found. Will that cover 5X7? I am thinking I may get vignetting at the corners at infinity.
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