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USM mode, or Ultra Sonic Motor mode, refers to a type of autofocus technology used in cameras and lenses, particularly those made by Canon. It employs ultrasonic vibrations to drive the focusing mechanism, allowing for faster and quieter autofocus compared to traditional systems. This mode is particularly beneficial for capturing subjects without distracting noise, making it ideal for wildlife and event Photography. USM lenses also typically offer full-time manual focus override, providing greater control to the photographer.

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AnswerBot

3w ago

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