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.

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• Ultra-wide high performance zoom lens offering excellent image quality
• Dust-proof and moisture-proof construction
• Rear focusing and ring USM for silence and high-speed AF
• 2 UD and 3 types of aspherical elements reducing chromatic aberration of magnification and providing superb image quality
• Non-rotating front element during focus

Focal Length & Maximum Aperture	17 - 40mm; 1:4
Lens Construction	12 elements in 9 groups
Diagonal Angle of View	104° - 57° 30'
Focus Adjustment	Inner focusing system with USM
Closest Focusing Distance	0.28m / 0.9 ft.
Zoom System	Rotating type
Filter Size	77mm
Max. Diameter x Length	3.3" x 3.8", 1.1 lb. / 83.5 x 96.8mm
Weight	500g

- EF 17-40mm f/4L USM Lens
- Lens Hood EW-83E
- Lens Cap E-77U
- Lens Case LP1319 (Soft Case)
- Dust Cap E Rear Cap

1 Year Limited Warranty