aperture.

p1020034

(f/3.5, 1/160, ISO-800)

p1020035

(f/3.5, 1/200, ISO-800)

p1020034

(f/22, 1/10, ISO-1600)

p1020068

(f/3.5, 1/640, ISO-800)

p1020074

(f/5.6, 1/5, ISO-800)

p1020075

(f/22, 3.2′, ISO-800)

The larger your aperture (the smaller the number), the shallower your depth of field will be. So there’ll be more goodies out of focus. Similarly, being closer to your subject will make your depth of field more shallow. In terms of focal length, if you are using, say, a zoom lens, your depth of field will be much more shallow. In fact, any lens that has a zoom capability will have the potential to give the image a very shallow DOF. For a shorter lens, the adverse is true.

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