I have tried searching the forum and the internet, altough a lot of information can be found about the Grandagon-N it is hard to find information about the plain Grandagon (non-N).
When shooting 4x5 I close the lens down to f22. But, I want to start using the lens with a 6x9 back to hopefully be able to shorten my exposure times. I shoot most of my work at night and run exposure times from 30 to 60 minutes most of the time, sometimes this is still not long enough so I am hoping to be able to use f16 on 6x9 and shorten my exposures in some situations a bit.
I have seen on the Rodenstock site that the working aperture for the Grandagon-N 90mm 6.8 is stated at f22-f32, but I assume that this is to make sure the coverage is adequate. If I were to shoot for 6x9 at f16 the coverage would be more than okay, my question is: would the sharpness at this aperture be okay, or is this lens sharpest at f22-f32 and is f16 to soft to use the 6x9 negatives? I want to make analogue c-prints, approx 100cm wide with the negatives, I know 4x5 will be sharper and finer grained, but this is just for those cases where the exposure times end up being way to long.
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