I have a question regarding the Wiki-entry of the FED 28mm f/4.5 lens.
The excellent images in this entry depict a lens with serial #46191/37 which is not listed yet, I'd like to add it for completion but I do not know who's the owner.
As far as I've seen, the images were added by Luiz, do you also own the lens? I tried to contact you through email but the address specified in your account doesn't seem to exist anymore.
Apart from that - I think it's a great lens which gives surprisingly good images. It has quite some vignetting (corners of images are visibly darker) but I think this is a nice effect and not really a disadvantage. I use it a lot on my FED-S.