Canon EF 17-40mm f/4L UsM ultra wide angle zoom lens compatible with filter size - 77mm -L Type Lens
The EF17-40mm f/4L USM is a lightweight ultra wide angle Canon EF zoom lens. It is especially well suited for use with digital EOS SLR cameras with a focal length conversion factor higher than 1.
Ultra wide lens for analogue EOS SLR cameras
Standard zoom lens for digital EOS SLR cameras
Superior optical performance
Extensive set of high-end features
The Auto-focus works silently and quickly thanks to a fast central processing unit with an improved AF algorithm. You can override AF mode with manual focus should you wish.
Controlled by an electromagnetic diaphragm, the EF17-40mm f/4L USMs circular aperture can achieve a more attractive appearance to out of focus background areas in a picture.
The front of the lens does not rotate as you focus. This means, for example, that polarising filters still function effectively as you zoom in and out. At the rear of the lens theres a drop-in gelatin filter holder.
Highly resistant to moisture and dust, the EF17-40mm f/4L USM is ideally suited for use in harsh environments. Environment friendly lead-free glass is used throughout its construction.
|Angle of view (horzntl, vertl, diagnl)||93 degrees - 49 degrees 20', 70 degrees 30' - 34 degrees, 104 degrees - 57 degrees 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)|
|AF actuator||USM (1)|
|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 - 0.70 (1)|
|G.F.Holder III (hood III*)||NC|
|G.F.Holder IV (hood IV*)||(0)|
|AF actuator||(1) Mechanical full-time manual focusing built-in|
|Magnification - Extension Tube EF25 II||(1) Only compatible at tele|
|*Maximum number of Hood III/IV attachable. In case of zoom lenses, the maximum number applies to the short focal length|