- Aperture Range: f/1.4-16
- Hyper Sonic Motor (HSM)
- Floating Internal Focus System
- Minimum Focusing Distance: 11.8"
- Anti-Flare Super Multi-Layer Coating
- USB Dock: Adjust AF & Update Firmware
- Special & "F" Low Dispersion Elements
- Front Filter Thread Diameter: 67mm
- SIGMA Optimization Pro Software
- 9x Circular Aperture Blades

- Aperture Range: f/1.8-16 
- Fast Constant Maximum Aperture 
- Designed for APS-C-Sized Sensors 
- 35mm Equivalent Focal Length: 27-52.5mm 
- Hyper Sonic AF Motor 
- Internal Focusing and Zoom Design 
- One Aspherical Element and SLD Glass 
- Super Multi-Layer Coating 
- Canon EF-S Lens Mount 
- Compatible with Sigma USB Dock

• Ultra Wide-Angle lens with F1.4 brightness
• Focal length of 20 mm
• Art line delivers high-level artistic expression
• 2 x FLD & 5 x SLD glass elements
• Super multi-layer coating & Hyper sonic motor
• 9-blade rounded diaphragm
• High-precision, rugged brass bayonet mount
• Included Plastic cover lens cap
• Metal lens cap available (sold separately)
• Nikon F Mount
• Dimensions (D x L): 3.6 x 5.1 in
• Weight : 33.5 oz. (950 g)

- Aperture Range: f/1.4-16 
- Hyper Sonic Motor (HSM) 
- Floating Internal Focus System 
- Minimum Focusing Distance: 11.8" 
- Anti-Flare Super Multi-Layer Coating 
- USB Dock: Adjust AF & Update Firmware 
- Special & "F" Low Dispersion Elements 
- Front Filter Thread Diameter: 67mm 
- SIGMA Optimization Pro Software 
- 9x Circular Aperture Blades