Canon EOS 450D photography technique/lesson needed

[antz_1022]

May I know how can I take a photo of a specific subject like an apple to be very clear and with a blurd background using Canon EOS 450D?

[RichardTaylor]

Similar principals to the answer here, except with a DSLR you have more control over the zone of sharpness.

Using leica d-lux 4


Basically,
(1) Aperture priority
(2) Aperture wide open (low F number) or almost wide open.
(3) Background as far away as possible.
(4) You should be able to control the appearance of the background by zooming into the subject, this will reduce the amount of background in the camera's view.

See some examples (using people) in this post.
DOF Notes:2 - Blurring backgrounds with shots of multiple people