William Robb:
Through the magic of thread drift, we have lost track of one of the original poster's parameters, which was maximum magnification on a bellows. For this, the 50 will be the better choice, since it will give more magnification than the 100 at any given extension.
You mean if I both use the built-in macro capabilities *and* a bellows too?
Mostly, 1:1 is what I want, actually, or else many things I shoot won't fit in the frame anymore, but it's good to have the option to magnify more. With my current setup I can go to slightly less than 3:1.
anders ------------------------- http://anders.hultman.nu/ med dagens bild och allt!

