USM vs STM

Started Jun 9, 2012 | Discussions thread
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martin_k13
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USM vs STM
Jun 9, 2012

Hi,

I noticed the new autofocus mechanism in Canon's two new lenses, they include a step motor, which is basically a brushless motor for silent lens operation. I wonder if this will completely replace the USM motors in future lens products, or if this is just an addition to USM for certain lenses. I had a look, USM was introduced in the 80s, so this could be a leap ahead in technology.

What do you think?

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Canon EOS 40D Canon EOS 6D Canon EF 50mm f/1.4 USM Canon EF 16-35mm f/2.8L II USM Canon EF 24-70mm f/2.8L USM +1 more
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