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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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A-DEP

The Automatic Depth-of-Field exposure mode is a handy method to use when you want to maximize the range of sharpness in your image. The camera actually selects an f/stop that will allow as much of the subject matter you’ve framed as possible to be in sharp focus, and then applies the shutter speed necessary to provide a good exposure at that aperture. The disadvantage of this mode is that you relinquish control over shutter speed, f/stop, and focus distance (which makes A-DEP a bit more like a Basic Zone scene mode than a true Creative Zone mode). You might end up with the required depth-of-field, but a blurry photo because the XSi has selected a shutter speed that’s too slow for handholding!

A-DEP performs its magic by examining the nine ...

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