Used Canon EF 17-40mm F/4 L | U8

The Canon EF 17-40mm f/4L USM is a professional ultra-wide-angle zoom lens that has earned a reputation for its sharp optics, durable L-series construction, and dependable performance. Featuring a constant f/4 maximum aperture throughout its 17–40mm focal range, it is an excellent choice for landscape, architecture, travel, and event photography where consistent exposure and wide perspectives are essential. Its optical design incorporates one Super UD element and three aspherical elements to reduce chromatic aberrations while delivering crisp detail, accurate colors, and strong contrast across the frame. The ring-type Ultrasonic Motor (USM) provides fast, quiet autofocus with full-time manual focus override, allowing photographers to make precise adjustments without switching focus modes. Built with weather-resistant sealing when paired with a protective front filter and a compatible EOS camera body, the lens is well suited for demanding outdoor environments. Even years after its introduction, the Canon EF 17-40mm f/4L USM remains a popular and reliable option for photographers seeking a lightweight, professional-quality ultra-wide zoom for both full-frame and APS-C Canon cameras.