• Lens construction: 19 elements in 15 groups (6 FLD, 2 SLD, 5 aspherical elements)
• Large-aperture standard zoom lens
• HLA (High-response Linear Actuator)
• Highest resolution throughout the entire zoom range
• Aperture ring
• AFL Buttons (2)
• Zoom lock switch
• Lens hood with a lock
• Dust- and splash-proof structure
• Compatible with the Lens Aberration Correction
• Designed to minimize flare and ghosting
• Evaluation with Sigma’s own MTF measuring system: A1
• High-precision, rugged brass bayonet mount