Originally Posted by
Brian Ellis
The effect of diffraction would show up as an overall "softness" of the image, it wouldn't cause only part of the image to be unsharp while other parts are sharp.
Tobasco, your technique sounds fine. I'd check for film "pop" as many others have stated and also a bellows or lens board leak. I had a lens board from which a cable release gizmo had been removed, leaving a small hole in the board. I foolishly didn't think to cover the hole and the resulting photographs looked a lot like what you're posting. So it's probably a long shot but worth checking.
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