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Can someone tell me the differences and advantages between the EF 75-300mm f/4-5.6 III lens and the EF 75-300mm f/4-5.6 III USM lens. Other than the price, of course. Has anyone had experience with these lenses, especially with the EOS Rebel XTi?

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Other than the ultra sonic motor vs direct current motor there is no real difference
Travis

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What is the practical difference between the ultrasonic motor and the DC motor? Is there a speed differrence?

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The ultra sonic is a bit faster but also smoother as well they claim the zoom is smoother on the usm model both lenses have 13 elements in 9 groups
Travis

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Thanks Travis, since I'm somewhat of a techie perfectionist I'll go the extra bucks for the USM model. I was considering the IS version, but for the price difference I can buy a lot of monopods.

Mark

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But the IS model is undeniably worth the bucks as i have found out of course that depends on what you are intersested in shooting if you shoot alot of sports or wildlife its worth the extra $$ but if you are always going to have a pod and shooting landscapes flowers and such the non IS model well do fine
Travis

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