Sigma AF 17-40mm F1.8 DC Art Lens L-Mount

High-Performance Wide-to-Standard Zoom for APS-C L-Mount Cameras

The Sigma AF 17-40mm F1.8 DC Art is a premium wide-to-standard zoom lens designed for APS-C L-mount mirrorless cameras. As part of Sigmas renowned Art series, it delivers exceptional optical quality, a constant f/1.8 aperture, and creative flexibility that rivals prime lenses all in a single, versatile zoom.

Ideal for photographers and videographers alike, this lens excels in low-light conditions, shallow depth-of-field work, and everyday shooting, making it a powerful all-rounder for travel, landscapes, street photography, portraits, and video production.

Key Features

Constant f/1.8 Aperture

• Bright f/1.8 aperture across the entire zoom range

• Excellent low-light performance and strong background separation

• Enables creative depth-of-field control typically reserved for primes

Versatile 1740mm Zoom Range

• Covers wide-angle to standard perspectives

• Approx. 25.560mm full-frame equivalent on APS-C

• Ideal for landscapes, environmental portraits, street, travel, and video

Advanced Optical Design

• Precision optical construction with aspherical and low-dispersion elements

• Delivers sharp detail, high contrast, and minimal distortion

• Controls chromatic aberration and maintains edge-to-edge clarity

Fast & Quiet Autofocus

• High-response linear autofocus motor for quick, accurate focusing

• Smooth, near-silent operation suited to both stills and video

• Minimal focus breathing for professional-looking footage

Professional Build & Handling

• Aperture ring with click switch and lock for intuitive manual control

• Premium construction consistent with Sigma Art standards

• Compact, well-balanced design suitable for handheld and gimbal use

Specifications

• Mount: L-Mount (APS-C)

• Focal Length: 1740mm

• Maximum Aperture: f/1.8

• Minimum Aperture: f/16

• Lens Construction: 17 elements in 11 groups

• Diaphragm Blades: 11 (rounded)

• Minimum Focus Distance: 28cm

• Maximum Magnification: 1:4.8 (at 40mm)

• Filter Size: 67mm

• Weight: Approx. 530g