Digital Photography Review on MSN
Cracking the Canon code: what letters like VCM, RF-S and DO tell you about your lens
USM stands for Ultrasonic Autofocus Motor. These lenses offer manual focus override and fast, smooth and comparatively quiet ...
I was writing a story about the new Canon RF 24mm F1.4L VCM hybrid lens and I scrolled all the way down to the small print and saw this: “The Voice Coil Motor in the lens emits a low-level magnetic ...
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