Canon EF 17-40mm f/4.0 L USM Lens
The EF 17-40mm f/4L USM Lens is a Canon L-series zoom featuring a constant f/4 maximum aperture along with a sophisticated optical design and durable construction. It can also be used with APS-C models where it provides a 27.2-64mm equivalent focal length range. One Super UD element is featured, along with three aspherical elements, which help to reduce both chromatic and spherical aberrations in order to realize high sharpness, clarity, and color accuracy. A Super Spectra coating has also been applied to suppress flare and ghosting for improved contrast in difficult lighting conditions. Rounded seven-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques. In addition to the front 77mm filter ring, this lens also has a rear filter holder for up to three cut gel filters. As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions.
Canon EF 17-40mm F/4L USM Specs
| Focal Length | |
| Maximum Aperture | |
| Minimum Aperture | |
| Lens Mount | |
| Lens Format Coverage | |
| Angle of View | |
| Minimum Focus Distance | |
| Maximum Magnification | |
| Optical Design | |
| Diaphragm Blades | |
| Focus Type | |
| Image Stabilization | |
| Filter Size | |
| Dimensions (ø x L) | |
| Length at Maximum Extension | |
| Weight |
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