Focal Length: 17 to 40mm (35mm Equivalent: 25.5 to 60mm)
Aperture: Maximum: f/1.8, Minimum: f/16
Lens Mount: FUJIFILM X
Lens Format Coverage: APS-C
Angle of View: 79.7° to 39.1°
Minimum Focus Distance: 11" / 28 cm
Magnification: 1:4.8 Macro Reproduction Ratio, 0.21x Magnification
Optical Design: 17 Elements in 11 Groups
Aperture/Iris Blades: 11, Rounded
Focus Type: Autofocus
Image Stabilization: No
Filter Size: 67 mm (Front)
Dimensions: 2.9 x L: 4.6" / 72.9 x L: 117.9 mm
Weight: 18.5 oz / 525 g

A Bright, Wide-to-Normal APS-C Zoom with an f/1.8 aperture throughout the entire zoom range, the Sigma 17-40mm f/1.8 DC Art Lens. Featuring prime-like optical performance and video-friendly design and functionality, its wide-to-normal focal range means a lighter kit bag without surrendering image quality.

Design and Performance
The lens features a total of 17 elements in 11 groups, with four aspherical and four Special Low Dispersion elements to minimize flare and ghosting and suppress various aberrations. This results in an optical performance that meets or exceeds that of other Sigma Art lenses, including the 18-35mm f/1.8 DC HSM Art lens. Along with its 11-blade, rounded diaphragm, the design promotes sharpness and a large, smooth bokeh when used wide open.
In addition to the f/1.8 maximum aperture, the lens also maintains an 11" minimum focusing distance across the entire zoom range. It achieves a maximum magnification ratio of 1:4.8 at its longest focal length, increasing depth of field and versatility in tight spaces.


Video Production
Designed with video creation in mind, the lens' bright f/1.8 aperture and wide-to-normal zoom range make it a versatile tool ideal for single-shooter, run-and-gun setups. An internal zoom design maintains the overall length during use, making it easy to balance on gimbals. The design also suppresses focus breathing for smooth movement across the focal range. Sigma's high-speed, high-response linear actuator autofocus remains both quiet and accurate, while manual focusing is improved with click-and-lock mechanisms.