I own a 50mm 1.4 and a Canon 400D, wich is the newer Xti and according to Canon(looked at that pdf), this lense isn´t compatible with the camera. I dont seem to understand this..how could they say such thing? Also, i noticed that the camera isnt compatible/interchangeable with a lot of other, more professional Canon cameras. Is that also possible? it kinda threw me off, now that i see that they claim that the lense isnt compatible with my camera..could there be more mistakes like these? Weird..