Im lost and I need help
Today I got 7 rolls of film back from my lab that I had shot over two weeks travelling across Europe, 3 B&W and 4 colour negative. I shot everything on my Nikon F4 with the Nikkor 1.8 50mm AF-D and a Skylight 1A filter. Everything thing seemed and sounded fine, I put fresh batteries in before I left and even brought spare batteries just in case.
Literally my last day there and unloading my last roll before leaving I noticed one of the one of the shutter blades in the film gate was out of place and stuck behind the film gate (Forgot to take photo of that) so as soon as I got back I took it to one of my local stores and they were able to fix it as I didn’t want to mess around with it. Now that I got the film back I can see the issue happened very early on, the first roll I shot through was fine, everything else after that is cropped because of the stuck shutter blade and im surprised I didn’t notice that issue. Problem one solved, problem two though is what im lost on.
Only the colour negatives are very underexposed with the occasional frame being completely overexposed, all the B&W are exposed correctly. I used exclusively Kodak Ultramax for my CN and had the ISO dial manually set for 400 ISO. Again same set up for all the rolls of film I shot, so im totally lost on what happened. Not even the people at the store/lab could think of an explanation for why the B&W is exposed correctly but not the CNI’ve never had any this happen with my F4 so im quite surprised by this. The only thing I could think of is this was my first outing with the AF-D 50mm 1.8, as I had bought it the week before I left for Europe, I had tested it on a Nikon D7200 before leaving to verify it worked and it seemed to be working fine. Any information or help would be greatly appreciated