Sigma AF 17‑40mm F1.8 DC Art Lens – Fujifilm X‑Mount

Bright Zoom Performance for APS‑C Mirrorless Cameras

The Sigma AF 17‑40mm F1.8 DC Art is a premium wide‑to‑standard zoom lens engineered for Fujifilm X‑mount APS‑C mirrorless cameras, designed to deliver exceptional optical quality, outstanding low‑light capability, and creative flexibility. Part of Sigma’s acclaimed Art line, this lens combines a constant f/1.8 aperture throughout the zoom range with high‑resolution optics — giving you the freedom to shoot in challenging light, shallow depth‑of‑field effects, and stunning image clarity from edge‑to‑edge. 

Key Features

Fast Constant f/1.8 Aperture

• Bright f/1.8 aperture across the entire zoom range provides excellent low‑light performance and smooth background separation.

• Ideal for indoor, street, event, and low‑light shooting without needing flash.

Versatile 17–40mm Zoom

• Covers wide‑angle to standard focal lengths (approx. 25.5–60mm full‑frame equivalent) — perfect for landscapes, travel, environmental portraits, and everyday photography.

• Expands creative framing without changing lenses.

Advanced Optical Design

• 17 elements in 11 groups — including SLD and aspherical elements — deliver sharp resolution, minimal distortion, and high contrast.

• Rounded 11‑blade diaphragm produces pleasing out‑of‑focus highlights.

High‑Speed Autofocus

• HLA (High‑response Linear Actuator) motor provides fast, quiet, and precise autofocus — great for stills and video.

• Minimal focus breathing helps ensure smoother focus transitions when recording. 

Thoughtful Handling & Control

• Customisable AFL buttons offer quick access to assigned camera functions.

• Dust‑ and splash‑resistant design with water/oil‑repellent front element helps keep the lens working in challenging environments.

Compact, Travel‑Ready Build

• Weighing ~530 g with a 67 mm filter thread, the lens balances portability with professional‑grade performance — ideal for travel and everyday use.

Specifications

• Focal Length: 17–40 mm (APS‑C)

• Maximum Aperture: f/1.8

• Minimum Aperture: f/16

• Lens Construction: 17 elements in 11 groups

• Diaphragm Blades: 11 (rounded)

• Minimum Focus Distance: 28 cm / 11.1 in.

• Magnification: 1:4.8 (at 40 mm)

• Filter Diameter: 67 mm

• Weight: 530 g approx.

• Mount: Fujifilm X

• Use Case: Landscapes, travel, portraits, low‑light photography.