Buying this canon lens soon. Is it best to get the USM version rather than standard EF version? I noticed these are dearer so I assume the focussing will be faster and more accurate for what I need (the occasional car-racing photoshoot)
Buying this canon lens soon. Is it best to get the USM version rather than standard EF version? I noticed these are dearer so I assume the focussing will be faster and more accurate for what I need (the occasional car-racing photoshoot)
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