Item Includes
• Sigma 17-40mm f/1.8 DC Art Lens (Canon RF)
• Sigma LCF-67 IV 67mm Front Lens Cap
• Sigma LCR III Rear Lens Cap (Canon RF)
• Lens Hood
• Carrying Pouch
• Limited 4-Year Manufacturer Warranty

Overview
The Sigma 17-40mm f/1.8 DC Art Lens Canon RF is a bright, wide-to-normal zoom lens for APS-C Canon RF-Mount mirrorless cameras. Its constant f/1.8 aperture delivers prime-like sharpness and excellent low-light performance throughout the zoom range. Compact and lightweight, it works perfectly for both photography and video, offering smooth bokeh, minimal focus breathing, and fast, quiet autofocus.

Features
• 17-40mm focal range (35mm equivalent: 25.5-60mm) covers wide-angle to normal perspectives
• Constant f/1.8 aperture provides shallow depth of field and strong low-light capability
• 17 elements in 11 groups with four aspherical and four SLD elements reduce flare and optical aberrations
• 11-blade rounded diaphragm produces smooth bokeh and clear subject separation
• Minimum focus distance of 11" (28 cm) and maximum magnification of 0.21x (1:4.8)
• Internal zoom design maintains lens length during zooming
• Reduced focus breathing supports smooth video recording
• High-speed linear actuator autofocus offers quiet, accurate focus
• Manual focus with click-and-lock mechanism for precise control
• Two AFL buttons and focus mode switch for convenient operation
• Water- and oil-repellent front element coating
• Dust- and splash-resistant construction
• Durable brass bayonet mount for long-term reliability

Specifications
• Focal Length: 17-40mm (35mm Equivalent: 25.5-60mm)
• Aperture: f/1.8 to f/16
• Lens Mount: Canon RF
• Format Coverage: APS-C
• Angle of View: 76.5° to 37.1°
• Minimum Focus Distance: 11" / 28 cm
• Magnification: 0.21x (1:4.8)
• Optical Design: 17 Elements in 11 Groups
• Diaphragm Blades: 11, Rounded
• Focus Type: Autofocus
• Image Stabilization: No
• Filter Size: 67 mm (Front)
• Dimensions: 2.9 x 4.6" / 72.9 x 115.9 mm
• Weight: 19.8 oz / 560 g
• Package Weight: 2.165 lb
• Box Dimensions: 11.4 x 4.9 x 4.7"