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Opticallimits > Forums > Just Talk > Rumours: Canon 40mm pancake and STM motor

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Rumours: Canon 40mm pancake and STM motor
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#12
06-08-2012, 11:03 AM
[quote name='Brightcolours' timestamp='1339150247' post='18765']

You can think whatever you want, you are wrong anyway. And stepper motor is NOT a micro motor, and is NOT cheaper than USM.

[/quote]

well, I later saw the word stepper motor. Yes, it's not the same as a DC servomotor, but both are "conventional" electromagnetic (EM) motor (versus piezo in USM).

I never saw a precise definition of what canon actually uses in lenses that state "micromotor".



anyway, just found this, so I guess it's possible to make cheap piezo:

http://www.newscaletech.com/doc_download...t_1006.pdf,

still, Canon charges more for their USM.
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Messages In This Thread
Rumours: Canon 40mm pancake and STM motor - by Guest - 06-06-2012, 10:22 PM
Rumours: Canon 40mm pancake and STM motor - by Guest - 06-07-2012, 12:20 PM
Rumours: Canon 40mm pancake and STM motor - by Guest - 06-07-2012, 03:42 PM
Rumours: Canon 40mm pancake and STM motor - by Guest - 06-08-2012, 09:23 AM
Rumours: Canon 40mm pancake and STM motor - by Guest - 06-08-2012, 11:03 AM
Rumours: Canon 40mm pancake and STM motor - by Guest - 06-08-2012, 07:26 PM
Rumours: Canon 40mm pancake and STM motor - by Guest - 06-10-2012, 07:15 AM
Rumours: Canon 40mm pancake and STM motor - by soborodin - 06-21-2012, 02:56 PM

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