Originally Posted by
Huub
That doesn't look like vignetting, but like the surge patern caused by a rotation development system. My guess is that the lab used a Jobo system and for one reason or the other haven't got their process under control. There is nothing much you can do about it, except returning to the lab and show them the issue. If necessary and possible, try a different lab.
Vignetting would look like completely dark corners or part of a circle or a more or less a straight line at the upper or lower side of the image. It is often caused by running out image circle of the specific lens, a lens shade that is intruding into the image or a saggy bellows obscuring part of the picture. This can be checked by looking through the clipped corners of the ground glass with an open shutter and a closed aperture. When you can see the full aperture through the clipped corners you are fine, if part of the aperture is obscured, you have an issue. And when your camera doesn't have clipped corners, look into the lens form the front side and check if you can see the complete groundglass and some more...
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