I tried this same shot when I first got the 400D with the kit lens, then tried it with EF-S 17-55 later on... here are the results:
EF-S 17-55 :
EF-S 18-55 Kit :
The kit lens shot was probably the second or third pic taken when I first go the camera... my first dSLR as well.


there was more setup involved and i'm just too lazy to wipe the dust off the guitar.
