About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element.
The combination provides superb contrast and sharpness, even at the widest settings. It’s ideal for both film and digital SLRs, and features the same weatherresistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens.
Ultra Wide Lens for Analogue EOS SLR Cameras
Ultra wide angle Canon EF zoom lens meant for professional and high amateur SLR EOS camera users.
Standard Zoom Lens for Digital EOS SLR Cameras
This can give an angle of view equivalent to that of a 28-70mm lens.
Superior Optical Performance
Super Spectra Coating on the elements ensures colour balance, minimises ghosting & flare to provide image quality.
Extensive Set of High-End Features
The AF works silently and quickly thanks to a fast central processing unit.
Specifications
Focal Length & Max. Aperture
17-40mm 1:4
Filter Diameter
77mm
Magnification with Extension Tube EF12
0.83x – 0.32x
Magnification with Extension Tube EF25
1.02x – 0.70x
Diagonal Angle of View
104° - 57° (43.2mm)
Horizontal Angle of View
93° - 49° (36mm)
Lens construction
12 elements in 9 groups
Minimum aperture
f/22
No. of aperture blades
7 (circular aperture)
Closest focusing distance (m)
0.28m
Focus drive
Ultrasonic
Dimensions
83.5mm dia. x 96.8mm
Weight
475g
*All data based on Canon's Standard Test Method
*Subject to change without notice