Just got a somewhat beat up 47mm XL today which I need to test to see if it is optically OK. Am I correct that I have to stop to f22 to get it to cover 4x5? At less than that do get vignetting, or just loss of image definition - I am thinking a sharp center and soft edges might be interesting on an ultra wide.
Any other tips? I have an Ebony 45SU and a bag bellows, so in theory I should be good on a flat board.
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