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What is the difference in EF-S 18-135 IS, IS STM and IS USM?

Started 8 months ago | Discussions thread
Aoi Usagi Veteran Member • Posts: 3,221
Re: What is the difference in EF-S 18-135 IS, IS STM and IS USM?
1

KENTGA wrote:

Thanks!

Kent

Here is a link to some of my travels since 2006. Feel free to comment.
https://www.flickr.com/photos/108062364@N04/albums
KENTGA = Kent from Georgia (metro Atlanta)

The main difference is the type of Autofocus mechanism.  The original IS version had somewhat of a noisy AF motor.  The STM upgraded to a stepper motor, which was quieter.  The latest USM version has an ultrasonic motor which is quiet and also faster than the STM version.

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