Canon USM lens

Discussion in 'Digital Discussion & Q&A' started by aweb108, Nov 12, 2009.

  1. aweb108

    aweb108 TPF Noob!

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  2. Derrel

    Derrel Mr. Rain Cloud

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    Ultra Sonic Motor = USM

    The specific Canon 100mm f/2.8 NON-USM lens shown uses the regular ring-style focusing motor Canon used/uses in older or lower-end lenses. That exact lens was made before the year 2000,and is the only Canon 100mm macro to have a solid,metal lens barrel. it also extends *tremendously* when focused to 1:1, since the lens has a rather simple extension focusing method of achieving close focus--the lens grows longer to focus closer. The subsequent design, the 100mm f/2.8 USM,which I own, does not gain any physical length when it focuses.

    The original 100mm f/2.8 shown in the auction however does have one redeeming value--it is considered one of the world's best bokeh lenses. Seriously.
     
  3. Hardrock

    Hardrock TPF Noob!

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    Get the one with usm. Thats just my 2cents.
     

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