Optical Construction: 20 elements in 15 groups, including one Fluorite element and two UD (Ultra-low Dispersion) elements to radically eliminate chromatic aberrations and ensure edge-to-edge sharpness.
Image Stabilization (IS): Features a 4-stop optical stabilizer with two modes (Mode 1 for static subjects and Mode 2 for panning with moving subjects).
Autofocus System: Powered by a Ring-type Ultrasonic Motor (USM) for blistering fast, silent autofocusing alongside full-time manual focus override.
Fixed Internal Design: Features an internal zoom and internal focus mechanism. The physical length of the lens barrel never changes, preventing dust or moisture sucking into the lens.
Build & Weather Sealing: Wrapped in a robust, professional-tier chassis featuring dust and moisture-resistant weather seals around the lens mount and switches.
Physical Profile: Highly portable compared to its f/2.8 siblings, weighing just 705 grams and utilizing a 67mm filter thread
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