John Black Offline Upload & Sell: On
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With the slower focus you'll probably only use this lens as a macro and/or complain the AF when used as a telephoto. Whereas if you buy the USM version, even if you don't plan to use it as a telephoto, you'll still have that as a very viable option. Also, if you sell the lens at a later date, you'll recover more $$$ on the USM version.
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