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What IS Canon USM lens?
USM. USM (Ultrasonic Motor) is the most widely used AF motor type in the Canon EF lens range to date. This is the currently the fastest focusing motor in the Canon range, yet it allows you to still manually fine-tune focus without having to switch off autofocus completely.
What IS Canon STM lens?
When you see a Canon lens with STM in the name, it means that it features Canon’s Stepper Motor technology. Canon introduced this motor design to be a quieter and smoother focus system that allows for near-silent focusing during video recording.
What IS the difference between IS and USM lenses?
The terms USM and IS are commonly used in camera lenses. USM works on the autofocus mechanism of the lens while the IS compensates for the motion of the camera by moving the lens element inside.
What does STM mean on Canon lens?
STM stands for Stepper Motor and is a applied to a new range of Canon lenses which feature a new design of focus motors which, along with a new iris mechanism are designed to eliminate (auditory) noise during video recording.
What does STM lens mean?
STM stands for Stepper Motor , and this specific focus motor design was introduced to create a quieter and smoother focus for lenses that are being used to record video. STM lenses use a focus-by-wire system which means that the focus ring controls a motor, which in turn moves the internal lens elements.
What are Canon EF lenses?
Introduced in 1987, the EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for “Electro-Focus”: automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens.
What is a Canon EF lens?
The Canon EF-S lens mount is a derivative of the EF lens mount created for a subset of Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S mount are backward compatible with the EF lenses and, as such, have a flange focal distance of 44.0 mm.