So I just bought a Mamiya RB67 Pro (not Pro S or SD) and I have heard you can meter with a DSLR. I have a Nikon D7100 and I thought, "Why buy an expensive light meter when I can just use my DSLR?"
I am aware that you have to do some math. I am going to shoot with TRI-X 400. I was just wondering if someone could give me a formula of some type so I can use my Nikon D7100 to meter for my Medium format RB67.