I've found there's a serious problem with the 40mm lens that came with my camera. I get some massive vignetting from wide open and up to f5.6 (click here to see a shot at f5.6)
I've done some test rolls to explore it further and it is pretty bad!
here for test page
It does not seem to be affected by the lens shade or filter so it must be the lens. I have posted this over at the RF forum and people there have testified that their 40mm Noktons do not vignette noticably at any fstop so mine is a dud. You would have thought this would have been picked up before it left the manufacturer ... it seems it's another in the eye for Mr K and CV's seemingly poor Quality Control set up!
The lens will be goign back to Robert WHite's on Monday for a replacement.