Frank, I actually have the adapter, it is just that I have not found the 135 to be a particularly useful focal length for a 35mm rangefinder. I find that the 90/2.8 or 75/1.4 provide even less depth of field, are easier to focus, and are not as bulky (at least the 90 tele-elmarit M...). Since they focus closer, they are able to achieve the same degree of isolation in portraits. The framelines are much larger and easier to frame with, consequently they focus more precisely. Finally, I really don't like how the whole barrel rotates with the Canon 135, and how the aperture is so sticky. I would sell it if not for the fact that I think it would be a waste...it was only 100 dollars in the first place, and I am keeping it around in case I have a time when I need the extra reach. I can see how they are a great advantage for rangefinders with higher mag finders, or as a low cost alternative to some of the shorter, faster portrait lenses. But for me, it just isn't worth it.