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The Sigma 17-40mm F1.8 DC Art is a constant-aperture standard zoom built only for APS-C mirrorless cameras, here in Sony E-mount. It holds F1.8 from 17mm to 40mm, which is brighter than the usual F2.8 zooms in this class and gives roughly a 25.5-60mm full-frame view. It weighs 535g and uses an internal zoom, a silent linear AF motor and low focus breathing, so it suits hybrid photo and video work. Rivals like the Sony 16-55mm F2.8 G are smaller and lighter but a stop slower; this lens trades some size for low-light reach and shallower depth of field.
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The Sigma 17-40mm F1.8 DC Art is a standard zoom lens for APS-C mirrorless cameras, in Sony E-mount. It is the first Art lens for APS-C format cameras since 2016 and the first designed exclusively for crop-sensor mirrorless systems. It covers 17-40mm, equivalent to 25.5-60mm on APS-C, and keeps a constant F1.8 maximum aperture across the range.
The optical design uses high-precision aspherical elements to minimize axial chromatic aberration and sagittal coma flare. Super Multi-Layer Coating reduces flare and ghosting. The lens is sealed against dust and splashes, and the front element has a water- and oil-repellent coating.
An inner zoom mechanism keeps the lens length constant while zooming or focusing, which helps with gimbals, cages and handheld shooting. A High-response Linear Actuator (HLA) provides fast, nearly silent autofocus. Focus breathing is minimal, and the lens has an aperture ring with a locking mechanism to prevent accidental setting changes during video. Two AFL buttons can be assigned through supported camera models and are placed for use in horizontal and vertical orientations.
