
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 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. Finally, it offers weather-resistant construction similar to other high-end L-series lenses.
Sample Image

MTF Charts
![]() | ![]() |

| Focal Length & Maximum Aperture | 17 - 40mm; 1:4 |
| 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 |
| Mall Taman Anggrek Lt.3 No.342 Let. Jend S. Parman, Kav. 21 Jakarta Barat 1147 Telp. (021) 563 9380 - 563 9305 Fax. 563 9305 |
Grand Indonesia Shopping Town Westmall Lt.3 No.10 (WM-3-10) Jl. MH. Thamrin No.1 Jakarta Telp. (021) 2358 1128 -2358 1129 Fax. 23581128 |
Mall Artha Gading Blok B6 No.16 Jl Boulevard Artha Gading Jakarta Utara 14240 Telp. (021) 4586 3900 - 4586 3901 Fax. 4586 3901 |