"Mechanical Vignette" or image cut-off caused by the camera & bellows, "when racked up all the way?" rather than the lens image circle?
Fujinon 75mm f5.6 SWD has a spec image circle of 200mm @ f22 allowing about plus or minus 47mm on 4x5 (image circle required of 153mm).
If the 75mm SWD is running out of image circle the solution could be to use a Schneider 72mm f5.6 Super Angulon XL which has an image circle of 229mm @f22 which will increase the usable rise about plus or minus 15mm or 76mm of rise-fall.
If this is a Wista field camera, it would be very questionable if a Wista field camera can achieve that amount (76mm) of rise-fall using the standard bellows and flat bed field camera as delivered. Possible the mechanical vignette is caused by the lens being so far into the field camera body with the flat bed in front cutting of part of the lens image circle?
Bernice
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