Sigma 17-40mm f/1.8 DC DN Art Lens for Canon RF

The Sigma 17-40mm f/1.8 DC DN Art is the world's first zoom lens with a constant f/1.8 aperture across its entire range, designed specifically for APS-C Canon RF-mount mirrorless cameras. Covering a 25.5–60mm full-frame equivalent focal range, it replaces a bag full of primes with a single, versatile optic. Whether you're shooting weddings, events, street photography, or cinematic video, this Art-series lens delivers prime-like sharpness, beautiful bokeh, and a video-optimised build that performs flawlessly on gimbals and in run-and-gun setups.

Key Features

• Constant f/1.8 aperture throughout the entire zoom range — a world first for APS-C zooms
• Prime-like optical performance from Sigma's flagship Art series
• Internal zoom design maintains lens length for easy gimbal balancing
• Linear actuator AF — fast, quiet, and accurate for stills and video
• Minimised focus breathing for smooth, cinematic focal transitions
• 11" (28cm) minimum focus distance across the full zoom range
• 1:4.8 maximum magnification ratio at 40mm
• 11-blade rounded diaphragm for exceptionally smooth bokeh
• Two AFL buttons and focus mode switch for versatile control
• Dust- and splash-resistant with water- and oil-repellent front element coating
• Durable brass bayonet mount

Technical Specifications

• Focal Length: 17–40mm (25.5–60mm full-frame equivalent on APS-C)
• Maximum Aperture: f/1.8 (constant)
• Lens Mount: Canon RF
• Format Compatibility: APS-C mirrorless
• Optical Construction: 17 elements in 11 groups (4 aspherical, 4 SLD elements)
• Diaphragm Blades: 11 (rounded)
• Autofocus: Linear actuator (high-speed, high-response)
• Minimum Focus Distance: 28cm (11") across full zoom range
• Maximum Magnification: 1:4.8 (at 40mm)
• Weather Sealing: Dust- and splash-resistant
• Front Element Coating: Water- and oil-repellent
• Mount Material: Brass bayonet
• Weight: 700g

What's in the Box

• Sigma 17-40mm f/1.8 DC DN Art Lens (Canon RF-mount)
• Front and rear lens caps
• Lens hood
• Soft carrying case

Why Buy from Foto Discount World

• Authorised South African Sigma dealer with genuine manufacturer warranty
• Competitive pricing — currently on special from R18,895
• Expert advice from passionate photography specialists
• Fast nationwide delivery across South Africa
• Pre-order service available — call 012 548 5651 or email sales@fotodiscountworld.co.za