USM vs non-USM

Discussion in 'Australia Photography' started by David, Jan 21, 2004.

  1. David

    David Guest

    Canon EF lenses...
    What is the difference between USM and non-USM? In other words, if a
    standard lens is non-USM (doesn't use ultrasonic motors) does that mean it
    uses micromotors? (MM) And what is the disadvantage if any? Power
    consumption? Slower autofocus? (or simply lack of sales hype?) How
    significant is USM vs non-USM?

    Looking at the canon 28-200 non-USM for a photography student. It's bundled
    with an EOS 300. The canon EF lenses site no longer lists a 28-200
    non-USM - it only has the USM model. What does that mean?
    Thanks for your advice!
    David, Jan 21, 2004
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  2. David

    Adam F Guest

    get him/her a 50/1.8 and a 28/2.8 instead, don't need usm on those and 5x as

    adam f
    Adam F, Jan 23, 2004
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