Beginner Q, Canon lens

Started Oct 17, 2011 | Discussions thread
Jeff Peterman
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Re: Beginner Q, Canon lens
In reply to Deleted1929, Oct 18, 2011

Well, when there are two models of a similar lens, one cheap and without USM and one expensive and with USM, the latter is probably a more refined design (typically a smaller, numerically, aperture) that also helps in focusing.
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Jeff Peterman

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 Jeff Peterman's gear list:Jeff Peterman's gear list
Panasonic Lumix DMC-FZ40 Canon PowerShot S110 Canon EOS 7D Canon EF-S 10-22mm f/3.5-4.5 USM Canon EF-S 17-55mm f/2.8 IS USM +16 more
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