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FORUMS News & Rumors Lens Rumors and Predictions 
Thread started 21 Aug 2013 (Wednesday) 21:36
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New EF-S 55-250 STM?

 
gocolts
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Aug 21, 2013 21:36 |  #1

Depending on the "optical upgrades" this thing might be pretty solid. The old one wasn't bad, and if it's anything like the upgrade the 18-135 STM got, it might surprise some on it's optical quality, even if it's still made out of cheap plastic.

http://www.canonrumors​.com …announcement-tonight-cr3/ (external link)




  
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maverick75
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Aug 21, 2013 21:44 |  #2

we need a EF-M version!


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ceriltheblade
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Aug 21, 2013 23:40 |  #3

very interesting indeed.
i wonder what would prevent any lens from adding STM?
would addng STM reduce optical quality in the higher end lenses? for instance, would we one day see 70-200 III IS f2.8 STM?
i admit i haven't taken the time to learn too much about the STM at all


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maverick75
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Aug 22, 2013 21:30 |  #4

I have a 22mm STM and it's pretty quiet. Also focusing is actually really good during video on the M, not as good as a camcorder but miles better than the T4i/40mm STM combo I've also tested.


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tat3406
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Aug 23, 2013 20:49 |  #5

STM is quieter and faster than non usm lens, but cant compete to ring usm lens like 70-200 II IS.


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watt100
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Sep 02, 2013 17:45 |  #6

tat3406 wrote in post #16234804 (external link)
STM is quieter and faster than non usm lens, but cant compete to ring usm lens like 70-200 II IS.

never done a comparison but the difference is video

"Stepper motors are better at producing smooth, precise incremental movements, such as those required by contrast detect AF, and AF during video. Ultrasonic motors are better at jumping to the right focus point as part of a phase detection system"




  
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Shadowblade
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Sep 02, 2013 18:07 |  #7

So, what's the point of STM on a lens for a still camera, when it's not as good as USM for the phase-detection AF used by the camera (and most live view focusing is done manually anyway)?




  
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watt100
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Sep 03, 2013 08:42 |  #8

Shadowblade wrote in post #16262259 (external link)
So, what's the point of STM on a lens for a still camera, when it's not as good as USM for the phase-detection AF used by the camera (and most live view focusing is done manually anyway)?

google "STM USM"
some say STM is better, some say USM

and others say it's all in the marketing




  
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tkbslc
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Sep 03, 2013 11:05 |  #9

Shadowblade wrote in post #16262259 (external link)
So, what's the point of STM on a lens for a still camera, when it's not as good as USM for the phase-detection AF used by the camera (and most live view focusing is done manually anyway)?

Because it is cheaper. Canon is just replacing their cheap, noisy and jerky micromotors with cheap, silent and smooth STM motors. It hasn't replaced USM in any lenses that used to have USM. It's a nice upgrade for cheap lenses, mainly (like the one this thread is about).


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archer1960
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Sep 03, 2013 11:23 |  #10

Shadowblade wrote in post #16262259 (external link)
So, what's the point of STM on a lens for a still camera, when it's not as good as USM for the phase-detection AF used by the camera (and most live view focusing is done manually anyway)?

tkbslc wrote in post #16264192 (external link)
Because it is cheaper. Canon is just replacing their cheap, noisy and jerky micromotors with cheap, silent and smooth STM motors. It hasn't replaced USM in any lenses that used to have USM. It's a nice upgrade for cheap lenses, mainly (like the one this thread is about).

This ^


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New EF-S 55-250 STM?
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