| 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 |
