Stepper motors are electric motors that rotate in steps. When autofocus is engaged, you lose the option to adjust the focus ring manually. The ring or gear system is the one that composes the focusing system in Ring USM lenses.
The movement of the gear makes this lens noisier than some of its counterparts. The focus system is generally way more smooth and quiet when filming.
STMs provide smooth movement while recording. When using an STM lens, the focus tends to be fast enough, which is always a nice thing to have when taking photographs. The price of these lenses is relatively low. Canon STM lenses have a quieter autofocus system making them more ideal for video shooters.
Meanwhile, Canon USM lenses are much faster at finding focus but are slightly noisier. Due to the noise, the USM system is better suited for photographers. There is no correct answer to this question. As for shooting video, the STM system offers an advantage due to reduced noise. USM lenses can still be used for shooting videos, but you may notice lens noise while your camera tracks between different focus points. The most important thing is that you know how to bring out the best in your lens.
It really just comes down to preference and what you are going to be using the lens for. So before making a choice, here are some things to take into consideration:.
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Notify me of followup comments via e-mail. Written by : Ben Joan. It will help to avoid the motor noise pick up during autofocusing. STM lenses produce less jarring and smooth videos. The choice between the two will mainly depend on your end use video or photography and the budget. If you are a professional photographer, then go for a USM lens.
If you plan to capture videos, then invest in an STM lens. The quiet AF and the smooth focus will capture noise-free videos. He is into photography since His main area of interest in photography include Birds, Nature, Wildlife, and Landscapes. He teaches all aspects of photography including the post-processing, through Photography Axis.
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Now, STM lenses offer a different type of focus motor—one tailored to the needs of videographers, though still adequate for still photographers. USM lenses are fast, but they can be very jerky. The AF motor starts, it stops, it moves back and forth like lightning.
USM lenses are much faster than STM lenses, which makes USM a better choice for action photographers, street photographers , and wildlife photographers. USM lenses also offer smoother manual focusing, given the mechanical connection between the focus ring and the focusing mechanism.
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