I am photographing in black and white on a white back drop. I can slightly see a few gradient shadow ripples or lines in my photos. I thought it was a lighting issue, but I moved my lights in every direction possible. I am using 4 strobes. 2 on the side, one on the front corner and one over head. You can see the shadowed ripples just barely on my calibrated monitor, but you can really see them when I develope them. I really need help. I have had this issue for quite sometime and have tried everything. I am desperate for some answeres.