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| p.1 #5 · 7D with 100-400 focusing question. |
If you are going to be doing any serious wildlife or BIF photography, you need to learn and become comfortable with using your focus ring for rapidly putting your subject in the general vicinity of correct focus as needed. this is the reason behind having a usm lens with full time manual focus.
if you subject fills your viewfinder, or most of your view finder, focusing is easier. of course most of the time that is not the case.