I am not sure if this helps but here are two images of the same scene, only difference is the lens and the widest aperture.
This one is of the 18-55mm f5.6 kit lens @ 55mm
http://i363.photobucket.com/albums/o...-001_55_56.jpg
This one is using a niffty fifty 50mm @ f1.8
http://i363.photobucket.com/albums/o...-002_50_18.jpg
both are focused on the front of the apple.