I have a nice condition Petri 28mm f2.0 MC full frame lens that isn't getting enough use so needs to go. It has a few marks around the filter ring but otherwise is excellent condition for its age. These seem to be a bit more common than they used to be a year or so ago, so how about £39 plus P&P
A couple of shots with it (sorry about the poor, fluorescent lighting)...
1. f2.0 - lovely, dreamy look:
2. f16 - a bit too stopped down but plenty of detail: