Key Features
- Ultrasonic Motor (USM): Features a Micro USM for fast and quiet autofocus, though it lacks the “full-time” manual focus override found on higher-end L-series lenses.
- Image Stabilization (IS): Includes a 3-stop Image Stabilizer that helps compensate for camera shake, which is critical when shooting at the 300mm telephoto end without a tripod.
- Optical Design: Uses one UD (Ultra-low Dispersion) glass element to reduce chromatic aberration and maintain high resolution and contrast throughout the zoom range.
- Zoom Lock: A mechanical lock at the 70mm position prevents “lens creep” (the lens extending on its own) while being carried.
- Aperture: Features an 8-blade circular aperture diaphragm designed to produce smooth and pleasing background blur (bokeh).

























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