Description
Canon EF 17-40mm f4L USM
The Canon EF 17-40mm F4.0L USM has been on the market for many years now, but remains popular with Canon photographers using both full-frame and APS-C DSLRs (on which it covers an equivalent focal length range of 27-64mm). An extremely tough and compact lens, the 17-40mm does not get any larger when zooming or focusing, and the inclusion of three aspherical and one Super UD (Ultra-low Dispersion) elements result very good image quality across its focal range. This lens is weather-sealed, and a ring-type ultrasonic focus motor provides fast and silent AF with full-time manual focusing.
Specifications
| Focal Length | 17 to 40mm |
| Maximum Aperture | f/4 |
| Minimum Aperture | f/22 |
| Lens Mount | Canon EF |
| Format Compatibility | Full-Frame |
| Angle of View | 104 to 5730′ |
| Maximum Magnification | 0.24x |
| Minimum Focus Distance | 11.02″ / 28cm |
| Optical Design | 12 Elements in 9 Groups |
| Diaphragm Blades | 7, Rounded |
| Focus Type | Autofocus |
| Image Stabilization | None |
| Filter Size | 77 mm (Front) Gel Filter (Rear) |
| Dimensions ( x L) | 3.29 x 3.81″ / 83.57 x 96.77mm |
| Weight | 1.1lb / 500g |
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