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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 28 Aug 2013 (Wednesday) 09:00
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micro usm v stm

 
chrise17
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Aug 28, 2013 09:00 |  #1

As the cheaper lens use a micro usm as opposed to the ring type is the stm technology faster at af than the micro motor usm and a further question how good is stm at following a moving subject for a still photo,
any experiences?

I know stm is better for video use so these questions are related for stills.




  
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Keyan
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Aug 28, 2013 14:09 |  #2

In my experience the micro USM is barely better at focus lock and tracking than a regular motor driven focus. The STM motors are supposed to be a significant improvement over the regular motors, so I would think that would carry through to the micro USM too.

Honestly, with the new 55-250 STM, unless you are on full frame I have no idea why anyone would buy the 70-300 non-L with the micro motor USM anymore.


Cameras: 7D2, S100
Lenses: 17-55 f/2.8 IS USM, 18-135 STM, 24-70 f/4L IS USM, 50 f/1.4 USM,70-300L IS USM
Other Stuff: 430 EX II, Luma Labs Loop 3, CamRanger

  
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tat3406
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Aug 29, 2013 21:36 |  #3

For my experience, STM better than micro motor. I had a EF 50mm f1.4 that built with micro motor usm, the focusing is slower, always hunting and not accurate than my 40mm pancake. That is why Canon Newly design lens was no micro motor again.


6D, 100L,24-70 F4L, 40mm pancake, 70-300L
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jt354
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Aug 29, 2013 21:39 |  #4

STM in my experience with the 40mm is very quick to acquire focus for still subjects. I haven't had any issues with tracking my fast-moving Golden Retriever either. It is absolutely awful for manual focusing though.


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Scott ­ M
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Aug 30, 2013 07:14 |  #5

I own both the 40mm f/2.8 pancake (STM) and an EF 50mm f/1.4 (micro motor), plus used to own a 70-300 IS (micro motor). I find the auto focus performance of the STM pancake is quicker and smoother than the other two lenses.


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micro usm v stm
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