Canon EF-S 17-55mm f/2.8 IS USM Lens for DSLR Cameras

The Canon 1242B002 is an EF-S 17-55 mm f/2.8 IS USM zoom lens made for Canon APS-C DSLR cameras. Its focal range, which translates to roughly 27-88 mm on a full-frame body, lets you move from sweeping landscape views to flattering portrait perspectives without changing lenses.

The lens keeps a bright f/2.8 aperture throughout the entire zoom range. Because the aperture stays wide, you can maintain higher shutter speeds in dimly lit interiors, evening events, or shaded outdoor locations. That same wide opening also lets you create a gently blurred background that draws attention to your subject during portraits or detail shots.

Canon builds the optical path with Ultra-Low Dispersion glass and molded aspherical elements. These components help control chromatic aberration and distortion, so images remain sharp and colours stay true even when you shoot at f/2.8 or capture scenes with strong contrast.

An integrated Image Stabilizer compensates for up to three stops of camera shake. Handheld photos and videos become steadier when you are working without a tripod, shooting in low light, or following action in the field.

The ring-type USM autofocus motor finds focus quickly and operates almost silently, which is useful at weddings, in wildlife settings, or when recording video with live sound. Full-time manual focus is always available, allowing precise adjustments without switching modes.

A 77 mm front filter thread accepts common polarizers or neutral-density filters, and the overall build feels solid yet manageable for day-long assignments. As a result, the lens suits hobbyists who want a dependable walk-around option as well as professionals who need consistent performance for events, travel, or documentary work.

• 17-55 mm focal length on APS-C bodies covers wide views through short-telephoto portraits
• Constant f/2.8 aperture supports low-light shooting and shallow depth-of-field effects
• Ultra-Low Dispersion and aspherical elements help maintain image clarity and colour accuracy
• Optical Image Stabilizer offers up to three stops of shake compensation
• Ring-type USM provides fast and near-silent autofocus, with full-time manual override
• Accepts 77 mm filters and features a durable construction suited to daily use