| I own it | I want it | I had it |
| 545 | 52 | 111 |
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.
| Lens type | Zoom lens |
| Focal length | 17–40 mm |
| Image stab. | No |
| Lens mount | Canon EF |
| Max aperture | F4.0 |
| Min aperture | F22.0 |
| Min focus | 0.28 m (11.02″) |
| Max magnification | 0.24 x |
| Weight | 500 g (1.10 lb) |
| Length | 97 mm (3.81″) |
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 | 16.1 megapixels 3″ screen Four Thirds sensor |
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