Key Features
- EF-Mount Lens/Full-Frame Format
- Aperture Range: f/4 to f/22
- One Super Ultra-Low Dispersion Element
- Three Aspherical Element
Spanning a versatile wide-angle range, the EF 17-40mm f/4L USM Lens is a Canon L-series zoom featuring a constant f/4 maximum aperture along with a sophisticated optical design and durable construction.