The Canon EF-S 18-135mm f/3.5-5.6 IS USM is a highly versatile zoom lens designed for Canon's APS-C (EF-S mount) DSLR cameras. It's often lauded as an excellent all-around "walk-around" lens due to its broad focal range and modern features.
Here are its key features:
EF-S Mount for APS-C DSLRs: This lens is specifically designed for Canon's APS-C sensor DSLR cameras (e.g., Rebel series, 80D, 90D). It will not mount on full-frame EF mount DSLRs.
Versatile 18-135mm Zoom Range: Offers a wide focal length range from true wide-angle (18mm, equivalent to approx. 29mm on full-frame) to a significant telephoto (135mm, equivalent to approx. 216mm on full-frame), making it suitable for landscapes, portraits, travel, and even some telephoto subjects.
Nano USM Autofocus Motor: This is a standout feature. Nano USM combines the speed of Canon's traditional Ring USM (Ultrasonic Motor) for still photography with the smooth, quiet operation of STM (Stepping Motor) for video. This results in very fast and virtually silent autofocus, which is excellent for both stills and movie shooting, preventing focusing noise from being picked up by microphones.
Optical Image Stabilization (IS): Features a 4-stop optical image stabilizer that helps to minimize camera shake, allowing for sharper handheld photos and smoother video, especially in low light or at longer focal lengths. It also includes dedicated IS modes, such as a panning mode.
Dynamic IS (for Video): Enhances stabilization during video recording, especially when walking or shooting handheld, by combining optical IS with digital stabilization.
High Optical Quality: The lens incorporates UD (Ultra-low Dispersion) and aspherical elements to reduce chromatic aberration and distortion throughout the zoom range, contributing to good image clarity and contrast.
Compatible with Power Zoom Adapter PZ-E1: This lens is uniquely designed to work with Canon's optional Power Zoom Adapter PZ-E1. This accessory attaches to the bottom of the lens, allowing for smooth, motorized zooming that can be controlled via a lever on the adapter or wirelessly from a compatible camera/smartphone app – ideal for professional-looking video zooms.
Compact and Lightweight Design: Despite its broad zoom range, the lens maintains a relatively compact size and light weight, making it comfortable to carry for extended periods.
Circular 7-Blade Diaphragm: Contributes to a pleasing out-of-focus background (bokeh), which is desirable for portraits and subject isolation.