I'm trying to buy a camera, and have been looking around for quite some time. I saw a package deal on one of Canon's digital SLRs. It says it will come with 2 USM Lenses. The question I have is USM and IS (Image stabilizer) the same thing? Will a USM Lens have the image stabalizing feauture that the IS has? I thank you in advance for your time and effort!

No, they are not the same, USM is UltraSonic Motor for the focusing system for a faster and quieter focus on AF the IS is Image Stabilizer (You are correct) and that helps you w/ aperature settings and shutter speeds (you can run up to 3 f-stops faster w/ it). That is why you see lenses that have USM and some that have both

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One Response to “What is the difference between IS and USM when referenced to Canon's EOS Lenses?”


  1. grifterds
    July 5th, 2006 at 12:56 am

    No, they are not the same, USM is UltraSonic Motor for the focusing system for a faster and quieter focus on AF the IS is Image Stabilizer (You are correct) and that helps you w/ aperature settings and shutter speeds (you can run up to 3 f-stops faster w/ it). That is why you see lenses that have USM and some that have both
    References :

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