- Super Wide-Angle Lens for Scenery and Architectural Photography
- 15 elements in 12 groups
- 2 Aspherical Lenses
- One Super Extra Low Dispersion Lens
- 3 Extra Low Dispersion Lenses
- Nano GI coating effectively suppresses ghosting and flare
- Weather / dust resistant with -10C low-temperature operation
- Inner Focusing System with Linear Motors ensures fast and quiet AF