Equipped with an inner zoom mechanism, the Sigma 17-40mm f/1.8 DC | Art Lens ensures smooth focusing and high optical performance. The f/1.8 large-aperture standard zoom has a compact and lightweight design that makes it the perfect lens for videographers and brings unmatched specifications to the APS-C format, showcasing Sigma's unique expertise and technological advancement.

Features:

• A constant maximum aperture of F1.8 across the entire zoom range
  
• SLD glass to suppress chromatic aberration and coma flare
  
• Lightweight and compact size
  
• Inner zoom mechanism
  
• High-response Linear Actuator technology to suppress focus breathing
  
• Aperture ring with various functional options
  
• Water- and Oil-Repellent coating
  
• Dust and splash resistant