Focal Length & Maximum Aperture 135mm 1:2.0 Lens Construction 10 elements in 8 groups Focus Adjustment Rear focusing system with USM Closest Focusing Distance 0.9m / 3 ft. Max. Diameter x Length, Weight 3.2" x 4.4", 1.7 lbs. / 82.5 x 112.0mm, 750g
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