Hello, I need a wide angle for my 501CM. My plan is to eventually get a 40 but I do need a wide soon (as in end of June) and since I do not have the money for a 40 now, I'm looking at various cheap 50/4 CT* lenses. Is there something I need to watch out for? I mean the lens will work and has a 6 month warranty so I'm not worried about that. But are the optics good or is there any issue with certain versions of them...? Sorry, I'm new to the the whole C/CT/CF/CB area so I don't know much! For the record, I have a 501CM with 80CB which I find very nice indeed. Bear in mind that the 50 will generally be used stopped down to f/8-16 as where I'm going it will be nice and sunny! So if the older CT* is not that good wide open, no harm done. How about flare issues? Do I need to look for a certain designation on the lens or lettering? Thanks.