Canon EF 17-40mm f/4L USM



A high-quality, wide-angle zoom for a variety of subjects.

The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens that offers excellent image quality and a constant maximum aperture. Its compact, lightweight body makes it an ideal travelling companion.

  • Superb optical performance throughout the zoom range
  • Fast autofocus speed
  • Highly resistant to dust and moisture
  • 28cm minimum focusing distance at all focal lengths

Available on back-order


Canon EF 17-40mm f/4L USM

Angle of view (horzntl, vertl, diagnl) 93° – 49°20′, 70°30′ – 34°, 104° – 57°30′
Lens construction (elements/groups) 12/9
No. of diaphragm blades 7
Minimum aperture 22
Closest focusing distance (m) 0.28
Maximum magnification (x) 0.24 (at 35mm)
AF actuator USM¹
Filter diameter (mm) 77
Max. diameter x length (mm) 83.5 x 96.8
Weight (g) 500
Magnification – Extension Tube EF12 II 0.83 – 0.32
Magnification – Extension Tube EF25 II 1.02 – 0.70¹
Lens Cap E-77U / E-77II
Lens hood EW-83E
Hard case
Soft case LP1319
Extenders EF1.4x II and EF2x II Not compatible
AF actuator ¹ Mechanical full-time manual focusing built-in
Magnification – Extension Tube EF25 II ¹ Only compatible at tele