Current list of Canon Ring Ultrasonic / USM camera lenses include: EF 16-35mm f/2.8 L II USM EF 20mm f/2.8 USM EF 24mm f/1.4 L USM EF 35mm f/1.4 L USM
has a silent focus motor built into the lens. Sigma 24mm f/1.4 DG HSM Art. Sigma 28mm f/1.4 DG HSM Art. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance.
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canon ef 24mm f 1.4 l ii usm vs 35mm
