Sigma 17 40mm F 1 8 DC Review | 54 Data compared

The Sigma 17-40mm F1.8 DC | ART is an upscale zoom lens designed specifically for APS-C mirrorless cameras, serving as a modern, lighter successor to the classic 18-35mm F1.8 DSLR lens. Priced at $829 USD, it boasts a highly flexible 25.5-60mm full-frame equivalent focal range while maintaining a fast, constant F1.8 maximum aperture. Structurally, it inherits the professional build of Sigma's full-frame ART series, featuring thorough weather sealing, a declickable aperture ring, an iris lock, custom buttons, and an internally zooming design that preserves the lens length for gimbal use. Autofocus is driven by a silent, high-torque HLA (High speed Linear Actuator) motor, which provides instantaneous focus speed and excellent tracking accuracy for stills and video. Optically, the lens delivers outstanding, prime-like sharpness and high contrast across the center and mid-frame, alongside beautiful bokeh rendering and solid flare resistance. Despite its strong performance, the lens exhibits a few notable optical and functional drawbacks. For video shooters, it is not parfocal, meaning the focus visibly shifts when zooming, and its high-thrust focus motor can occasionally result in abrupt, less cinematic transitions...

The lens presents a compelling list of pros, led by its incredibly fast and constant f/1.8 aperture that makes it 1.33 f/stops faster than standard full-frame f/2.8 "trinity" zooms while remaining far more affordable at $919 «!contextual(citationKey="0.1.1", source="""Fast and constant f/1.8 aperture... baseline at $919""", node=135)/>>. Other notable pros include its excellent edge-to-edge sharpness, robust weather-sealed construction, and the internal zoom mechanism that prevents the lens from changing physical length «!contextual(citationKey="0.1.1", source="""Excellent all-round performance... internal zoom mechanism""", node=135)/>>. However, the review notes a few cons, such as its limited mount options and a heavy reliance on automatic in-camera distortion corrections to fix barrel distortion at 17mm and pincushion distortion at 40mm «!contextual(citationKey="0.1.1", source="""Limited mount options... distortion correction""", node=135)/>> «!contextual(citationKey="0.1.1", source="""heavy barrel distortion at 17mm... distortion.""", node=137)/>>. Additionally, there is a minor drop-off in corner sharpness when combining the widest 17mm focal length with the maximum f/1.8 aperture, though this is easily resolved by stopping down to f/2.8 «!contextual(citationKey="0.1.1", source="""drop-off in sharpness when combining... f/2.8.""", node=137)/>>. Overall, it is highly recommended as a standout value-for-money lens that can easily replace multiple...

The Sigma 17-40mm F1.8 DC Art ($919) is a groundbreaking standard zoom lens designed specifically for select APS-C mirrorless systems, including Canon RF, Fujifilm X, Sony E, and Leica L mounts. It is highly praised for bringing a bright f/1.8 aperture to crop-sensor cameras, allowing photographers to achieve full-frame level background blur, subject isolation, and excellent low-light performance. Built with a thermally stable composite polycarbonate body and a weather-sealed metal mount, the lens features a moisture-repellent fluorine coating and an incredibly fast high-speed linear actuator (HLA) autofocus motor. Optically, it delivers very sharp center detail at f/1.8 and achieves excellent edge-to-edge resolution when stopped down to f/4–f/8. However, the review highlights several distinct drawbacks to consider before purchasing. A major omission is the lack of optical stabilization, making it heavily reliant on cameras equipped with in-body image stabilization (IBIS). Its focal range (17-40mm) provides a relatively short 2.4x zoom ratio compared to competitors like the Tamron 17-70mm F2.8. Additionally, while the lens blurs backgrounds effectively, the resulting bokeh can become busy in complex scenes due to visible soap bubble effects...

The FujiFrame review describes the Sigma 17-40mm f/1.8 DC Art as a fast-aperture standard zoom that brings prime-like bokeh and exceptional low-light performance to Fujifilm X-mount cameras, featuring a robust, weather-sealed build. Its internal zoom mechanism ensures a consistent, well-balanced handling experience, particularly on larger bodies or gimbal setups. However, the lens has notable drawbacks, including a 525-gram weight that can feel front-heavy on smaller cameras like the X-T5. Due to its internal design, it remains a physically long lens, and the review notes it prioritizes optical performance over the compact profile preferred by some users.

The 5050 Travelog review praises the Sigma 17-40mm f/1.8 DC Art as an excellent, fast-aperture standard zoom lens that serves as a highly compelling alternative to the first-party Fujifilm XF 16-55mm f/2.8 R LM WR II. Tested on a Fujifilm X-E5 camera body, the lens delivers premium build quality with a super-smooth zoom ring and a pleasantly clicking aperture ring. Optically, its biggest strength is its fast, constant f/1.8 maximum aperture, giving photographers an extra 1.33 stops of light compared to typical f/2.8 zooms. This allows for better low-light shooting at lower ISO values and significantly improved background blur and subject isolation. Another major physical advantage highlighted is the internal zoom mechanism, meaning the lens barrel does not physically protrude when zooming. On the downside, the primary limitation of the Sigma lens is its restricted zoom range. It provides a 35mm full-frame equivalent focal range of only 25.5-60mm, falling short of the broader 24-84mm equivalent coverage offered by the Fujifilm counterpart. In terms of handling, the lens weighs 18.5 oz (525 g) and can feel a tad bulky and unbalanced...

The Sigma 17-40mm f/1.8 DC DN Contemporary lens is a versatile, professional-grade zoom for APS-C cameras, featuring a bright, constant f/1.8 aperture suitable for low-light, portraits, and weddings. It provides exceptionally sharp, high-contrast imagery, utilizing a fast, quiet High-response Linear Actuator (HLA) autofocus system and offering a robust, compact build with a 11-blade diaphragm. However, the lens lacks optical image stabilization (OS), requiring bodies with internal stabilization (IBIS) for optimal handheld performance. While delivering impressive overall performance, the lens exhibits noticeable lateral chromatic aberration at 17mm, color blur at 40mm, and slightly soft corner performance at the telephoto end.

However, the lens has several clear optical and structural compromises. Its zoom range is notably limited, and its edge sharpness is quite weak at wideangle settings due to intense lateral chromatic aberration. Image quality also softens when shot completely wide open at f/1.8 or at close focus distances, where a noticeable "glow" from spherical aberration degrades pixel-level detail. Furthermore, while the lens body itself is reasonably compact, the included lens hood is awkwardly large and requires a wide 95mm slot for storage. While it may not replace a standard travel zoom, its ultra-large aperture makes it a highly recommended niche tool for indoor events and portrait isolation.

The Sigma 17-40mm f/1.8 DC Art lens is a lightweight, ultra-fast standard zoom lens designed exclusively for crop-sensor (APS-C) mirrorless systems, retailing for £779 / $919. Serving as a portable evolution to its 2013 DSLR predecessor, it slims down the weight by over 30% to just 535g while utilising a constant 28cm minimum focusing distance and an internal zoom mechanism that maintains a fixed lens length. Built with video creators and run-and-gun filmmakers in mind, it features a near-silent HLA linear motor for rapid autofocus, suppressed focus breathing, two assignable AFL buttons, and a fluid, stepless aperture control ring. The review highlights several core pros, most notably its prime-like image resolution, highly consistent centre sharpness even when shot wide open, and the excellent low-light performance provided by the fast, constant f/1.8 aperture. However, the lens does come with specific cons, including imperfect edge and corner performance wide open, lack of built-in optical image stabilisation, and the fact that it is not parfocal, meaning focus can shift when zooming. Furthermore, because it is strictly optimized for APS-C coverage, using it on...