This is a question we hear quite often here at The Phoblographer. Both f-stops are very popular and are on many of todays most popular lenses. Of course if this was the only factor to the question, my answer would be hands-down the 2.8 since it is a full stop faster than the other. But it’s not quite that simple is it?
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, or the 
DSLRs. Since I’ve reviewed the 7D and T2i and had 
