Canon EF 17-40mm f/4L USM

Lens Reviews / Canon Lenses i Lab tested
Lens Specifications
Name Canon EF 17-40mm f/4L USM
Image Circle 35mm
Type Wide Zoom
Focal Length 17 - 40mm
APS Equivalent 27 - 64mm
Max Aperture f/4
Min Aperture f/22
Diaphragm Blades 7
Lens Construction 12 elements in 9 groups, including 3 aspherical elements and 1 S-UD element
Diagonal Angle of View(Based on image circle) 104 to 57.5 degrees
Focus Details Inner focusing; full-time manual focus and USM;
Front Element Rotation No
Zoom System Rotary
Closest Focus 0.28m / 0.92 ft.
Magnification Ratio 0.24x / 1:4.2
Filter Size 77mm + drop-in gelatin filter holder at rear
Dimensions(Length x Diameter) 96.8mm x 83.5mm / 3.8 in. x 3.3 in.
Weight 500g / 1.1 lb
Notes Dust and moisture resistant
Typical Online Price US$750