Since a couple people asked, and it looks like I am the only one here who uses it (!?) a few words on the 90mm f4 and the eyes. I really enjoy it, the eyes do a great job of adjusting for the close focus, and of course with the m8 you can chimp to verify. The lens seems up to Leica quality. I have the 90 and the adapter in my regular bag, since the lens is light, and the adapter is practically weightless. The ability to do completely different kinds of things is terrific, in just a moment you can switch from taking regular street scenes to closeups of rusty locks or leaves or what have you.