Okay folks, here is the deal; I have the opportunity to go to the Phila zoo. I have only one memory card for my camera and no option to get another one. My present card only holds approx 485 shots using the L jpeg fine file size, which is where I've had it set since I got the camera. How much image quailty will I lose by setting it to a smaller file size so I can take more photos. The shots will be for my personal use only, in fact they will never be printed, at best I may send a few to friends in an email so I don't need top quailty; but I don't want crap that I can't zoom in on and crop either. This trip is really important to me because I may never have another chance to go and I'm looking forward to finally having some decent things to shoot with my dslr, but like I said, at the same time I want the shots to look half way decent after editing. Thank you much.