Canon EF 17-40mm f/4L USM Lenses
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
|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|
|Closest focusing distance (m)||0.28|
|Maximum magnification (x)||0.24 (at 35mm)|
|Filter diameter (mm)||77|
|Max. diameter x length (mm)||83.5 x 96.8|
|Magnification - Extension Tube EF12 II||0.83 - 0.32|
|Magnification - Extension Tube EF25 II||1.02 - 0.70¹|