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<p style="margin-bottom: 0in;"]Here's a question that I thought would
make for a good discussion where I've never seen much written about
it. How do you use the depth-of-field preview button on Canon's
DSLR's? I've owned a Rebel XT, 20D, 30D, 40D, and now the 5D2 where I've known
about the little button but I just don't understand how to use it
correctly. Is it worth using and will it really give you an accurate
view of the depth of field?