- Angle of view (Horizontal, Vertical, Diagonal): 84 to 34 degrees, 53 to 19 degrees, 74 to 29 degrees
- Lens construction: 12 elements in 9 groups
- Number of diaphragm blades: 7
- Minimum aperture: 22
- Closest focusing distance: 0.92 feet
- Maximum magnification: 0.24x (at 40mm)
- AF actuator: Ring USM
- Filter diameter: 77 millimeters
- Maximum diameter by length: 83.5 by 96.8 inches
- Weight: 17.6 ounces
- Magnification with Extension Tube EF 12 II: 0.83 to 0.32
- Magnification with Extension Tube EF 25 II: 1.02 to 0.40
- Lens hood: EW-83E
- Hard case: Not available
- Soft case: LP1319
- GF Holder III (Hood III): NC
- GF Holder IV (Hood IV): 0
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Description
A new 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 inches (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.
