Usm

RO: Usm - ultrasonic motor (motor EN: Usm (ultrasonic motor)

Fotografie

Sistem de propulsie inventat de Nikon si perfectionat de Canon pentru a ajusta punerea la punct; sistemul determina rotatia unui inel prin deplasarea unei unde de suprafata intr-o piesa din ceramica piezoelectrica. Sistemul este rapid, silentios si mai ales, permite ajustarea manuala a focalizarii dupa ce aparatul a determinat-o automat (Manual Override).
Fotomagazine

97%

Accuracy

Usm

Canon Lens Class and Technology Abbreviations - this abbreviation means the lens is equipped with Canon’s top-end focusing motor, the ring-type UltraSonic Motor. This is a fast, quiet and powerful autofocus motor that allows full-time manual focus override. It is used in most current Canon lenses from low-cost prime lenses all the way up to exotic telephoto and L-class lenses.

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92%

Accuracy

Usm (canon)

UltraSonic Motor; Canon s fastest, quietest autofocus lens mechanism.

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91%

Accuracy

Usm (ultrasonic motor)

Canon became the first camera maker to apply the use of an advanced USM (Ultrasonic Motor) in 1987 when the EF 300mm f/2.8L USM amazed the world with its silent, super-fast autofocus performance. Then, in 1990, Canon developed the lower cost ring-type USM could be used in a variety of more affordable lenses. This feat was followed in 1992 by the development of a new type of micro USM that enabled the automation of production. Every day Canon comes closer to realizing the goal of equipping every EF lens with a USM. Features of the ring-type USM include its ability to easily achieve the low-speed, high-torque characteristics needed to realize direct drive. Large holding torque means the disc brake automatically holds the lens in place when the motor is stopped. Its construction is extremely simple, operation is virtually noise-free, and it demonstrates excellent start/stop response and control. High efficiency and low power consumption allow the lens to be powered by the cameras battery. The motors ring shape is optimally suited to lens barrel applications and its low rotation speed is ideal for lens drive purposes. Rotation speed control covers a wide variable range from 0.2 rpm to 80 rpm to realize high-precision, high-speed lens drive control. Variable-sensitivity electronic manual focus is also available. The broad operating temperature range of -30ºC to +60ºC (-22ºF to 140ºF) ensures stable operation even in severe environments. And, all lens drive control is performed by the microprocessor housed within the lens.

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79%

Accuracy

Usm - ultrasonic motor (motor

Sistem de propulsie inventat de Nikon si perfectionat de Canon pentru a ajusta punerea la punct; sistemul determina rotatia unui inel prin deplasarea unei unde de suprafata intr-o piesa din ceramica piezoelectrica. Sistemul este rapid, silentios si mai ales, permite ajustarea manuala a focalizarii dupa ce aparatul a determinat-o automat (Manual Override).

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