The 17-40 f/4L is the younger sibling of the 16-35 f/2.8L. If you need a sharp wide angle zoom but you don’t need a fast lens then this is the one. The 17-40L is sharp, focuses quickly and is light and a joy to use.
|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|
|Max. Diameter x Length, Weight||3.3" x 3.8", 1.1 lb. / 83.5 x 96.8mm, 500g