Nic, others have likely answered your question. When you press the DOF
preview the aperture on the lens is closed down and this is one of the tools
you can use to see what the depth of field when be on that setting. When
the aperture is closed down, less light passes thru the lens and it will
become more difficult to see through the lens. Depth of field being the space
between the point where the image is in sharp or acceptable focus and
where it is no longer in sharp or acceptable focus. Three things will affect
your depth of field.
Focal length of the lens.
Aperture you set on the lens.
The distance between you and your subject.
Bill Barber
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