It’s brisk and nearly instantaneous - an almost perfect match for the new AF system in the EOS 80D. (The name has nothing directly to do with the type of vibrational energy it generates to drive a lens’s focus elements.) In this initial application, the motor itself is small enough to fit on the first joint of a model’s finger, as we see here:ĪF speed during still-image shooting rivals what users have come to expect from high-end lenses with Canon’s powerful ring-type USMs. Nano USM gets its name from the incredibly compact size of this motor. Using the same principles of ultrasonic vibration converted into movement, Canon engineers have developed a direct-drive system that’s incredibly compact, easily placed within the body of a lens, and has tremendous AF performance. In the new-for-2016 EF-S 18–135mm f/3.5–5.6 IS USM lens, Canon introduces a new answer to this challenge. Still, as user demands for increased video recording performance with each new generation of digital SLR camera have continued, Canon engineers recognized another approach was needed. And, their speed during still-image shooting was adequate for many applications. STM focus motors indeed provided that smooth and consistent ability to drive the lens during actual video recording. Canon engineers developed “STM” (Stepping Motor) AF technology and applied it to drive mechanisms within recent Canon EF and especially EF-S lenses in recent years. This sounds simple, but AF motors originally designed for superior AF performance during still image shooting - like Canon’s highly-regarded ring-type Ultrasonic Motors - tended to have less than ideal smoothness when asked to perform video-oriented AF. For video recording, that same fast drive usually results in a very jarring, unnatural viewing experience… video shooting usually requires smooth, consistent drive speed, without sudden starts and stops.For still images, users normally want fast, brisk drive speed that can start almost instantly, stop on a proverbial dime, and of course accurately put the sharpest focus where the user wanted it when it does stop.The simple fact is this: in most situations, what constitutes good AF performance in a lens differs significantly for still image shooting and for video:
The challenge: combine speed for still image AF with smooth response and drive for video recordingĪnd until now, that has indeed been a challenge for Canon’s engineers. This tiny new Ultrasonic motor achieves the combination of fast, near-instant response during still image shooting, with the smoothness required for good focus during video recording. We’ll concentrate on the Nano USM in this article, but will give some basic info about the new lens as well.Ĭanon’s new Nano USM technology uses a completely different form factor, but achieves focus results within the lens via the same principles of ultrasonic vibration energy, transmitted here into linear (rather than rotational) movement within the lens. The headline feature of this lens is a completely new type of Ultrasonic motor technology, called Nano USM. Nano USM - A New Ultrasonic Motor TechnologyĪlong with the introduction of the Canon EOS 80D camera, Canon engineers are introducing an updated version of the popular EF-S 18–135mm f/3.5–5.6 IS lens.
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