Just got this recently and also bought second hand...see how poor i am? The 450D will become my second body. Before buying this i already tried the DSLR when tag along with my friend to wedding event he been hired. I got to try 7D with Tokina 11-16mm 2.8f and it was superb. First thing that i notice and it was a good feature is button at your thumb AF-ON can use as to focus the lens and the shutter button for direct taking picture. When you use different button it make taking picture more faster rather than normal half press shutter button to focus then full press to take picture. I didn't know about this and it actually can be done on my 450D also...geezz....how noob i am. So if u also want to try this on your 450D, this how it work, first go to
