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Old Aug 27, 2009, 1:30 PM   #11
Join Date: Jun 2003
Location: Savannah, GA (USA)
Posts: 22,371

See this Depth of Field Calculator:


If you want a shallower depth of field, you'll need to use a closer focus distance and/or longer focal length and/or wider aperture setting (smaller f/stop numbers). IOW, you'll want to fill the frame more with your primary subject (so that it occupies a larger percentage of the frame) and open up the aperture to it's widest setting.

The larger the subject, and the smaller the sensor or film size, the more difficult is's going to be to isolate your subject from the background (depending on how far away it is) for a given aperture setting. In that case, the horses were occupying a relatively small percentage of the frame (increasing depth of field for that focus distance and focal length) and the aperture was at f/10 (with f/5.6 being the widest available aperture that lens has available when zoomed into 55mm as in that image with horses).
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