Lens / Hoods
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EF 17-40mm f/4L USM
- Optical coatings optimized for digital cameras
- Close focus to 11 in. / 0.28m
- Super UD and three Aspherical lens elements ensure superior image quality
- Dust- and moisture-resistant, constructed for professional use
A new and affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 in. / 0.28m, and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses.
Sample Image
MTF Charts
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| Focal Length Maximum Aperture | 17 - 40mm F/4.0 |
| Lens Construction | 12 Elements In 9 Groups |
| Diagonal Angle Of View | 104° - 57° 30' |
| Focus Adjustment | Inner Focusing System With USM |
| Closest Focusing Distance | 0.28m / 0.9 Ft. |
| Zoom System | Rotating Type |
| Filter Size | 77mm |
| Max Diameter X Length Weight | 3.3" X 3.8", 1.1 Lb. / 83.5 X 96.8mm, 500g |
Lens Hood EW-83E
Designed to prevent unwanted stray light from entering the lens. Compatible with the EF 16-35mm f/2.8L lens.
Lens Extenders / Close Up / Conversion Adapters
Extension Tube EF-12 II
Extension Tube EF 12 II is especially suited for close-focusing with wide-angle lenses.
Extension Tube EF-25 II
25mm fully coupled Extension Tube for EOS camera and most lenses to 350mm.
Cases / Lens
Lens Case LZ1319
Lens pouch cases are compact, yet keep your lenses looking like new.
Lens Caps
Lens Dust Cap E Rear Cap
Rear lens cap for all EF type lenses, lens extenders, and extension tubes. Used to protect the rear glass element from dust and scratches.
Lens Cap E-77 II
The Lens Cap E-77 II is newly designed and fits Canon EF lenses with a 77mm filter size. It helps protect the front glass from dust and scratches.
Lens Filters
Gelatin Filter Holder Hood IV
77mm Filter UV Protector
These filters can help protect your lens against dust, moisture, fingerprints, scratches and damage and can be kept on your lens at all times. Filter fits select lenses with a 77mm diameter.
Gelatin Filter Holder Adapter IV 77
The 77mm Gelatin Filter Holder Adapter IV 77 is used to attach the Gelatin Filter Holder IV to most EF lenses.
Gelatin Filter Holder IV
77mm Circular Polarizer PL-C
Polarizing filters enhance picture quality by blocking harmful reflected light. Use it to reduce light reflections from glass and water surfaces or to improve color saturation. Simple to use, these filters polarize light circularly, rather than linearly, so they do not interfere with autofocus or TTL light metering.
Lens Filters
77mm Circular Polarizer PL-CB
Filter enhances picture quality by blocking harmful reflected light.
