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USM vs STM which is better
#1
Still confused about USM vs STM, do both give decent quality for videos ?

I noticed my 18-55 STM outpeforms my 17-55f2,8 for video AF but it's not fair since 18-55 has much greater DOF 

anyone can help ?

#2
If your camera supports full use of STM in video-mode, the STM-drive

will produce smoother AF-operation in video-mode as compared to USM.

 

So, with the right camrera and with the emphasis on video, STM is

likely the way to go.

#3
Exactly, USM is often too nervous often goes from front to back focus before locking on 17-55 while transition is smooth on 18-55
#4
Actually Nano USM is the way to go now ;-)

  


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