Ater weeks and weeks of homework, I have just purchased the 450D and 17-55 f2.8 IS USM, as well as the 70-300 f4/5.6. I have taken about 700 shots using every combination that comes with the camera and 17-55 lens. I am absolutely disappointed in the results. Blurred, soft, some over exposed, but even on a tripod, faster shutter speed, I still do NOT have a sharp image at 100%. My S5 IS takes a better image. Obviously I thought it was driver error, but after reading all the advice and experimenting, with no better result, I may have a bad camera body. Is this possible? Could it be the 17-55 lens? I am totally at a loss what to do, and the combination was expensive in AUD. I have been into photography for years, film slrs and compact digital, now dslr. It comes down to driver error or equipment error - any help will be greatly appreciated, preferably before I hang myself.