EOS-M camera

Dan7312Dan7312 Registered Users Posts: 1,330 Major grins
edited October 14, 2012 in Cameras
This is something that seems to have appeared recently on the Canon site. What does STM lens refer to?

http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eos_m_ef_m_22mm_stm_kit#Overview
Dan

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Comments

  • ziggy53ziggy53 Super Moderators Posts: 24,156 moderator
    edited October 14, 2012
    Canon's "STM" designation stands for "Stepper Motor" as the type of autofocus motor technology. Stepper motors are nothing new in terms of motor technologies, they have been used for decades as positioning motors for impact computer printer heads, but I do believe that Canon is the first to use them as focus motors for lenses.

    Since it's possible to know the absolute focus position from this type of motor drive technology, I suspect that soon we will see dSLR bodies capable of automated accurate and repeatable rack focus and follow focus in video applications.

    As it is, stepper motors should provide similar performance to the USM motors currently used in Canon's better and best lenses.
    ziggy53
    Moderator of the Cameras and Accessories forums
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