A 50mm lens screwed into the IXOTUB, SIXTUB, or SIRIOTUB? Yup, they are in there. Yes, with the 606, M-600, M-601, et cetera, you do just count the clicks. If you are really fortunate, you have found the little clamp-on handle that hangs down from the aperture ring for easier turning than getting your fingers up into the 'TUB to set the aperture. I am 6'3" tall, and I have hands to match. Getting to the aperture ring on a Schneider Componon 50mm f:4.0 lens was always a problem.