EF 17-40mm f/4L USM

A new and affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses.

Lightweight super wide-angle zoom lens with high image quality that meets the needs of professionals

Lightweight ultra wide-angle zoom lens. 3 aspherical lens elements and a Super UD glass element assures superior optical performance.

• Focal length and maximum aperture: 17-40 mm 1:4
• Lens construction: 12 elements in 9 groups Diagonal angle of view: 104°-57° 30’
• Focus adjustment: Ring-type USM, inner focusing system, full-time manual focus
• Closest focusing distance: 0.28 m/ 0.9 ft., 024 x magnification
• Filter size: 77 mm Max. diameter x length, weight: ø 83.5 x 96.8 mm, 475 g/ 3.3” x 3.8”, 1 lbs.

MTF Charts 

1/500sec., f/11

Lens Construction
UD Lens
Aspherical Lens

Write a review