Hi, I have a IIIa, Summar, Summitar, Elmar 90/4, and Canon Sererar 35/3.2. I use these lenses interchangably with my M3 via adaptors. I love the IIIa, though. I just recently got its slow speeds working properly, and I use it much more often. The Summar, surprisingly, although it has cleaning marks, is just as sharp as my other lenses although it does have its own unique signature. Here's a couple from this weekend; IIIa, Summitar, Tri-x, developed in D-76. The second shot was handheld with the IIIa at 1/5 second.
