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Difference between a non USM and USM lens??

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Difference between a non USM and USM lens??

Postby mrjake2002 » Thu Nov 15, 2007 11:17 am

Hello. I'm looking to buy myself a DSLR camera (probably a Canon EOS 400D Digital Rebel XTi). It comes with the 18-55mm lens kit and you can get a EF90-300mm non USM lens fairly cheaply with it. I was wondering, what is the difference between a non USM lens and a USM one? I've noticed most people have USM lenses but im not sure what it means.  :-[ Help appriciated.  :)
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Re: Difference between a non USM and USM lens??

Postby Hagar » Thu Nov 15, 2007 11:23 am

USM means Ultrasonic Motor. http://photonotes.org/cgi-bin/entry.pl?id=USM

[i]"USM.

(Canon) Ultrasonic motor. Canon
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Re: Difference between a non USM and USM lens??

Postby Mictheslik » Thu Nov 15, 2007 1:02 pm

The focusing is much quicker, but personally, I don't notce a difference in noise....

I would reccommend USM, especially for aircraft/fast moving abject shots ;)

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Re: Difference between a non USM and USM lens??

Postby mrjake2002 » Thu Nov 15, 2007 4:54 pm

Cheers. Looks like I'll just have to be patient.  ;) Might I ask how much you paid for your kit mic?
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Re: Difference between a non USM and USM lens??

Postby Mictheslik » Thu Nov 15, 2007 5:14 pm

Cheers. Looks like I'll just have to be patient.  ;) Might I ask how much you paid for your kit mic?


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