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What is the difference between these two Canon lenses?

  1. Canon EF-S 18-135mm f/3.5-5.6 IS STM
  2. Canon EF-S 18-135mm f/3.5-5.6 IS
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    \$\begingroup\$ One is horizontal and one is vertical. Beyond that, one has STM and the other doesn't. \$\endgroup\$
    – dpollitt
    Jan 18, 2016 at 1:40

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One is the older Canon EF-S 18-135mm f/3.5-5.6 IS and one is the newer Canon EF-S 18-135mm f/3.5-5.6 IS STM.

The newer STM version is an all around better lens. It has slightly improved optics for slightly better image quality. It also has STM (stepper motor) Auto Focus which is faster and virtually silent.

You can tell the difference in photos because the STM version clearly says "STM" on the front and it has "Canon" closer to the front of the lens barrel.

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