Oh, Zorro! You got me grounded!! Didn't unnerstand a word
But at least Luis is partly right
The only setting that influences depth of field is aperture.
partly because the only other two things that that influence dof are
3. pixel-pitch of the sensor
But as (3) does only change with the body it can be disregarded.
Magnification is a very important driver of dof so if you get close to your subject or take a long lens you can decrease dof pretty effectively. But that was already explained in detail by Luis...
The one thing that most people don't know or believe is that you can produce an identical dof with a 10.5mm fisheye at f2.8 or a 200mm/f2.8
Just focus on a subject 21cm away with the fisheye or 4m away with the tele. In both cases the magnification is 1:18 and the dof identical.
As an example of the power of magnification over apertures see this shot at f16(!) with my trusty old VR 18-200mm:
Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews
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