Took my 4x5 out to the park yesterday to photograph some new snow. I only exposed two negatives. Both came back with the centers a few stops thinner than the rest; like a radial gradient had been applied. See attached pics. I can't even begin to guess what might have caused this. Frame1: Frame2: -Both frames are FP4+, loaded at the same time into two different film holders, from the tail end of a box of 25 sheets that has given me no other problems. The box of film has lived in my fridge for several months, and these sheets were loaded into film holders just an hour or so before they were exposed. Film holders were kept in a dark pocket of my camera bag until time of exposure, as usual. -Both were taken with my 90mm lens, which has also never given me any problems. Frame 1 was taken facing almost directly away from the sun, frame 2 was taken facing almost directly into the sun. -Frame 1 was shot at f/11 using an orange filter. Frame 2 was shot at f/22 using no filter. -Both negatives were exposed within 25 minutes of each other. -Both negatives were souped using my normal method, at the same time, in the same Beseler color tube on rotating base, using the same chemistry (250 ml of Rodinal 1:100 to be precise). -I can't think of a time when either negative could have been exposed to a light leak of any kind, let alone one that would affect frame edges but not the center. To be clear, the center shows slightly less than expected density (about a stop), while the edges show 2-3 stops more than expected density (so about 3-4 stops more than the center). Anyone have insight to offer?