Personally, I still have trouble getting any useful idea of
depth of field by using the depth of field preview but I do find
it invaluable for judging the quality of the out-of-focus
background in macro shots. I tend to think of it as a "quality
of bokeh preview" button.
>Pressing the DOF preview button stops the lens down to the aperture you
>have it set to. This allows you to see what will be in focus and what
>will not, whereas normally you're always looking through the lens at its
>widest aperture, where you'd have no idea of what will be in focus when
>the lens stops down for the shot. The downside, of course, is that
>stopping the lens down makes the viewfinder a lot darker, which makes this
>a somewhat limited technique to use indoors. But outdoors, especially on
>nice sunny days (and even in some interiors as well) it works beautifully.
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