Quote Originally Posted by Anupam Basu
Great! I am planning to use the lenses reversed to go about 7x life size upwards, so the lens mount isn't important. (snip)
The greatest difficulty you will have using reversed lenses in smaller formats at that magnification, is the lack of working distance from the (now) front element of the lens... as well as having the distance to allow the "light" to reach your subject. (we will not say anything about the severe curtailment of DOF and curvature of field) One easy cure might be to reverse mount a wide angle lens to the front of a longer lens mounted on the camera in the normal position. I have a book hidden away (somewhere in a pile of boxes) for the calculation of effective f-stops.