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