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Hi
I do a lot of photography work on the side and consider myself a semi-pro. I use Minolta so I can't really comment on the quality of the lenses. The macro lenses in general will allow you to get much closer to the subject. The size of prints is something to consider, as you could probably get by with the 50mm if you can crop a lot, meaning you won't be able to print as large. If I recall correctly the USM simply focuses faster and more quietly, not supremely necessary for this type of work. The field of view would probably be best somewhere between 70 and 110mm (though 50 is not too bad). Good lighting, set up, background etc (and use a tripod) will probably make up for most lens deficiencies.One good place to ask this question is in the canon forums at dpreview.com.
David Whittingham
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