I had really nice results printing from my 450D at 20*30 inches. No problem whatsoever. I wouldn't hesitate to go even larger if I had to. Problem is that my internetprintingservice doesn't go beyond 20*30 and I don't have the room to put any larger than that in my room [:P]


That's with a non-cropped picture by the way. I assume the more you crop, the smaller your maximum print will be. But 20*30 shouldn't be a problem.


Good luck





Edit: I see the 450D == XSi and you ask for "only" 16*24, you don't have to worry at all!


Unless the printingservice is real bad of course [6]