Another thing to note: Proximity to the subject. Will affect the DoF as well. The closer you are to the subject (and closer to minimum focus distance you are) the thinner the DoF. Conversely, the closer you are to hyperfocal focus (infinity) the wider the DoF is. The best illustration I can give is macro photography. The DoF is incredibly thin (on the order of millimeters, sometimes) even with a relatively closed aperture. This has its upsides and downsides. The obvious downside is that focus is more difficult when up close and at a wide aperture, sometimes necessitating a few steps backward. On the plus side, you can always stop down for tight crops to F/2.8 or even f/4 to increase the DoF which helps focus and still maintain a fair amount of background blur and bokeh.
Nov 06, 2009 at 09:33 AM
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