This is an EF lens 20-35mm f/3.5-4.5 USM.
- Focal length and maximum aperture: 20-35 mm 1:3.5-4.5
- Lens construction: 12 elements in 11 groups
- Diagonal angle of view: 94°-63°
- Focus adjustment: Inner focusing system with USM
- Closest focusing distance: 0.34m / 1.1ft
- Filter size: 77mm.
Highly portable lens with high optical performance and lightweightHighly portable lens with high optical performance and light weight of 340g. A very practical ultra-wide-angle zoom. The large front lens group minimizes peripheral darkening, and the flare-blocking diaphragm minimizes flare. Also, with lens group 2 being the zoom group, distortion is corrected.