Key Features

• Professional Canon L-series ultra wide-angle zoom lens
• Designed for Canon EF-mount full-frame DSLR cameras
• Compatible with Canon APS-C DSLR cameras (27.2-64mm equivalent)
• Versatile 17-40mm ultra wide-angle zoom range
• Constant f/4 maximum aperture throughout the zoom range
• Three Aspherical elements reduce distortion and improve edge-to-edge sharpness
• One Super Ultra-Low Dispersion (Super UD) element minimizes chromatic aberration
• Ring-Type Ultrasonic Motor (USM) for fast, quiet, and precise autofocus
• Full-Time Manual Focus Override
• Super Spectra Coating reduces flare and ghosting
• Rounded 7-blade diaphragm for smooth background blur
• Internal focusing system with non-rotating front element
• Dust- and moisture-resistant construction (with optional front filter installed)
• Ideal for landscapes, architecture, interiors, travel, events, and video production

Product Description

The Canon EF 17-40mm f/4L USM Lens is a professional L-series ultra wide-angle zoom lens engineered for Canon EF-mount full-frame DSLR cameras. Renowned for its excellent optical quality, durable weather-resistant construction, and lightweight design, this lens is an outstanding choice for landscape photographers, architectural specialists, travel photographers, event shooters, and filmmakers.

Its versatile 17-40mm focal length provides expansive ultra wide-angle coverage while maintaining the flexibility to transition into a natural wide-angle perspective. On Canon APS-C DSLR cameras, the lens delivers an effective focal length of approximately 27.2-64mm, making it an excellent wide-to-standard zoom.

The constant f/4 maximum aperture ensures consistent exposure throughout the zoom range, making it well suited for both photography and video recording while maintaining reliable performance in a wide range of lighting conditions.

Its advanced optical design consists of 12 elements in 9 groups, incorporating three aspherical elements and one Super Ultra-Low Dispersion (Super UD) element. These specialized optical components effectively minimize distortion, chromatic aberration, and spherical aberrations while producing exceptional sharpness, contrast, and color accuracy from edge to edge.

Canon's Super Spectra Coating helps reduce flare and ghosting caused by internal reflections, maintaining high contrast and accurate color reproduction even when shooting toward bright light sources.

Fast, quiet, and highly accurate autofocus is powered by Canon's Ring-Type Ultrasonic Motor (USM), providing professional autofocus performance with Full-Time Manual Focus Override, allowing photographers to fine-tune focus instantly without switching autofocus modes.

The internal focusing system keeps the lens length constant during focusing, while the non-rotating front filter thread simplifies the use of circular polarizers and graduated neutral density filters, making it especially valuable for landscape photography.

Built to Canon's renowned L-series standards, the lens features dust- and moisture-resistant construction when used with a protective front filter, ensuring dependable performance in demanding outdoor environments.

Compact for an L-series ultra wide-angle zoom and weighing approximately 475 g (16.8 oz), the Canon EF 17-40mm f/4L USM is an excellent companion for photographers seeking professional image quality in a portable package.

Specifications

What's Included

• Canon EF 17-40mm f/4L USM Lens
• Canon E-77 II 77mm Front Lens Cap
• Canon Lens Dust Cap E (Rear Cap)
• Canon EW-83E Lens Hood
• Canon LP1319 Soft Lens Case
• User Documentation