Originally Posted by ranger9
If you want to use one of these on a Leica M camera, it might be easier to find the LTM version (like the one pictured) and use a simple screw-to-M adapter, right? The screw mount version was the one I had; used it on my Canon VI-T, which has a 100mm frame line that was close enough. I used it on a monopod (taking advantage of the built-in tripod mount, which later models didn't have) for theater photography. One frustration: the tripod mount is fixed in place (although slotted so you can find-tune its position a bit) so if you suddenly wanted to shoot a vertical, you'd have to frantically unscrew the camera and lens.
I shot a lot of pictures I liked with my 105/2.5 — I especially liked the contrast and texture — but after I got a 100mm f/2 Canon, I concluded it was just as good, plus lighter and a half-stop faster, so I kept it and traded away the 105/2.5. Still, super-nice lens to use well worth having!
I will mostly use the lens on a mirrorless camera so am happy (for now) with the Nikon mount version. Using it on a Leica is kind of an option I thought would be nice if possible. I did look but I found the Leica mount lenses harder to find and I think more expensive for obvious reasons so I settled for the Nikon one on those grounds. Also I thought I might end up with some additional Nikon RF glass eventually so buying a Nikon S mount lens and eventually maybe a adapter that allows use on Leica cameras might give more over all flexibility as it would allow use with a wider array of lenses. (Though (a) this is dependent on finding an adapter at reasonable price and (b) I am still unclear as to whether the same adapter works with Nikon and Contax mounted glass).
I have been thinking of a Canon 100mm f2 which are very nice but also quite expensive to buy, by comparison, so I think I will be happy with the Nikkor which after all is a superb lens with a great reputation.