Hi, I took a few pictures with a Nikon 50mm 1.4, this one I think: http://www.destoutz.ch/lens_50mm_f1.4_2999999.html The "problem" is that wide open has very little contrast, at f/2 there is a big jump and another one at 2.8. I did a quick google search and I found this: http://www.dpreview.com/forums/thread/3447222 Exactly the same. In this thread I found this sentence: "Like most of the older lenses on a quarter of a sensor, you have way too much light in the chamber that is bouncing around without any real benefit to it. What you need to do is put the wafer on the back of the lens to cut this light of." Well, what is the wafer? I couldn't find much on google.