From what I had been taught it doesn't make any difference but my partner who is a photography teacher at the local college and a 20 yr pro wedding photographer is convinced that there would be light falloff to deal with. I didn't have an effective argument to give him. On the surface what he said seemed like it could make sense but I never heard that you would have to change aperture. Thanks for the answers I'll give him the URL to this forum and he can see the answers for himself. Thanks