ART

17-40mm F1.8 DC

ART

17-40mm F1.8 DC

Available Mounts

L-MOUNT
CANON RF MOUNT
FUJIFILM X MOUNT
SONY E-MOUNT

Standard zoom lens with a large aperture and rendering capability comparable to a prime lens
Highly portable and versatile for any situation
Functions to support video production

With an F1.8 large aperture and exceptional image quality comparable to a prime lens across the entire zoom range. This zoom lens for APS-C mirrorless cameras pushes the boundaries of still and video expression.

The Sigma 17-40mm F1.8 DC | Art builds upon the groundbreaking innovations of the Sigma 18-35mm F1.8 DC HSM | Art, which earned high acclaim as the world’s first F1.8 zoom lens in the photography and video industry. Thirteen years after its debut, this next-generation lens achieves not only superior optical performance but also a wider focal length of 17-40mm while reducing its weight by over 30%. This dramatically enhances the versatility of a large aperture standard zoom lens.
In addition to the fast and quiet autofocus driven by the HLA (High-response Linear Actuator), the lens incorporates an inner zoom mechanism and minimal focus breathing, ensuring outstanding performance for both still photography and video production. Sigma, the pioneer that stunned the world with the first-ever F1.8 zoom lens, has once again revolutionized the history of large aperture zoom lenses with groundbreaking advancements.

Camera Type	Mirroless
Corresponding Mount	L-Mount,Canon RF Mount,FUJIFILM X Mount,Sony E-mount
Sensor Format	APS-C [DC]
Lens Construction	17 elements in 11 groups (4 SLD, 4 aspherical elements)
Angle of View	L-Mount：79.7-39.1° Canon RF Mount：76.5-37.1° FUJIMILM X Mount：79.7-39.1° Sony E-mount：79.7-39.1°
Number of Diaphragm Blades	11 (rounded diaphragm)
Minimum Aperture	F16
Minimum Focusing Distance	28cm / 11.1in.
Maximum Magnification Ratio	1:4.8 at f=40mm
Filter Size	φ67mm
Dimensions (Diameter × Length)	L-Mount: φ72.9mm x 115.9mm / φ2.9in. x 4.6in. Canon RF Mount: φ72.9mm x 115.9mm / φ2.9in. x 4.6in. FUJIFILM X Mount: φ72.9mm x 118.2mm / φ2.9in. x 4.7in. Sony E-mount: φ72.9mm x 117.9mm / φ2.9in. x 4.6in.
Weight	L-Mount: 535g / 18.9oz. Canon RF Mount: 560g / 19.8oz. FUJIFILM X Mount: 530g / 18.7oz. Sony E-mount: 525g / 18.5oz.
Edition Number	A025 The three-digit code on the surface of the lens is to indicate the year the lens was first released. (Since it is different from the year of manufacture, the release year and edition number may not match depending on the mount.)
Supplied Accessories	POUCH LENS HOOD LH728-02 FRONT CAP LCF-67 IV REAR CAP LCR III
Mount / Product Barcode	L-Mount：0085126 214692 Canon RF Mount：0085126 214722 FUJIFILM X Mount：0085126 214753 Sony E-mount：0085126 214654
Camera Compatibility	LINK
	* The appearance and specifications of the product are subject to change. * This product is developed, manufactured and sold based on the specifications of E-mount which was disclosed by Sony Corporation under the license agreement with Sony Corporation. * Canon RF Mount is developed, manufactured and sold under license from Canon Inc.

Constant maximum aperture of F1.8

The Sigma 17-40mm F1.8 DC | Art has the convenience of a zoom lens with a constant aperture of F1.8 throughout the zoom range. Taking advantage of a large aperture comparable to a prime lens, the lens is suitable for low-light environments such as indoor and night scenes, as well as for expression using large bokeh.

Excellent optical performance

The optical design, realized through the latest design and processing technologies, including the use of high-precision aspherical lenses, achieves excellent optical performance.
By emphasizing the correction of axial chromatic aberration and sagittal coma flare, the lens achieves high resolution even at the wide-open F1.8 aperture, rendering delicate textures and fine details with stunning clarity.

Flexible framing made possible

The zoom range of the Sigma 17-40mm F1.8 DC | Art has been expanded from its predecessor the Sigma 18-35mm F1.8 DC HSM | Art, covering 25.5-60mm in 35mm format *. From wide-angle tabletop photography to portraits that fully utilize the telephoto angle of view, users can take full advantage of the expressive power of the large F1.8 aperture while freely framing their shots without the need to change lenses.

* Approximately 27.2-64mm for the Canon RF Mount version.

Designed to minimize flare and ghosting

Using advanced simulation technology and Sigma’s Super Multi-Layer Coating, flare and ghosting have been largely eliminated, ensuring that the lens renders rich, high-contrast results in all conditions.

Practical and stable inner zoom

Employing an inner zoom mechanism, the overall length of the lens remains constant when the focal length or focus distance changes. This means the lens is easy to use and highly stable when shooting hand-held, on a tripod or gimbals, and even more resistant to dust and water contamination.

Enhanced mobility with a compact and lightweight design

The Sigma 17-40mm F1.8 DC | Art is over 30% lighter and has a filter diameter of 67mm, which is one size smaller than its predecessor the Sigma 18-35mm F1.8 DC HSM | Art. Despite being a large aperture zoom lens, it is surprisingly portable. The expressive power of F1.8 can be used with a compact APS-C system, making it ideal for travel and everyday photography, as well as video production, where mobility is key.

Dust- and splash-resistant structure * / water- and oil-repellent coating

In addition to a dust- and splash-resistant structure, the frontmost surface of the lens has a water- and oil-repellent coating applied, so that the lens can be used safely even in harsh outdoor environments.

* The product is designed to be dust- and splash-resistant but is not waterproof. When using the lens near water, etc.,
take care not to allow large amounts of water to splash on it. If water gets inside the lens, it may cause a major malfunction and render the lens unrepairable.

Equipped with two AFL buttons

Equipped with two AFL buttons *1*2 that can be assigned any function from the camera menu. By placing them on the side and top, users can easily operate the buttons in either landscape or portrait positioning.

*1 Functions can be assigned on supported cameras only. Available functions may vary depending on the camera used.
*2 The FUJIFILM X Mount version has an AF function button that can be used to select AF lock/AF operation via lens switch.

L-Mount / Sony E-mount

FUJIFILM X Mount

HLA-driven high-speed AF

The adoption of HLA (High-response Linear Actuator) enables quiet, high-speed, high-precision autofocus. The smooth, stable autofocus is perfect not only for still photography, but also for single-operator shooting with a gimbal or vlogging.

Minimal focus breathing

The focus breathing is suppressed, minimizing changes in the angle of view caused by focus shift and enabling smooth, natural-looking focus pulls when recording video.

Aperture ring with various functions

Equipped with an aperture ring *1 for intuitive control of the aperture. When shooting video, users can turn off the click switch for smooth, quiet aperture control. It also has an aperture ring lock switch *2 to prevent accidental changes to the aperture during shooting.

*1 The Canon RF Mount version has a control ring instead of an aperture ring. It does not have an aperture ring click switch or lock switch.
*2 If you turn it on in position A, the aperture ring will be locked in position A. If you turn it on in a position other than A, it will be locked in the range from open to minimum aperture, and it will not be possible to turn it to position A.

L-Mount / Sony E-mount / FUJIFILM X Mount

Canon RF Mount

LENS CONSTRUCTION

MTF Chart

DIFFRACTION MFT

GEOMETRICAL MFT

MTF CHART GUIDE

The MTF (Modulation Transfer Function) is one of the measurements for evaluating a lens’ performance, and it shows how faithfully the contrast of the subject can be reproduced on the image plane. The horizontal axis shows the image height (distance from the center of the image in mm) and the vertical axis shows the contrast value (maximum value is 1).
The closer the 10 line pairs/mm curve is to 1, the higher the contrast and clarity of the lens is, and similarly, the closer the 30 line pairs/mm curve is to 1, the better the resolution and sharpness of the lens is.

*The MTF chart depicts the result at the wide-open aperture.
*For mirrorless lenses that support distortion correction, the horizontal axis shows the image height equivalent to when an L-Mount lens is attached to a Sigma L-Mount camera with distortion correction applied. (The effect of distortion correction may differ depending on the mount and camera used.)
*The spatial frequency indicates the variation on the image plane before distortion correction is performed.

Stepping Motor

The lens is capable of smooth, quiet and high-speed AF made possible by a stepping motor, as well as supports Face/Eye Detection AF and video AF.

Water and oil repellent coating

Incorporates a water and oil-repellent coating that allows water to be wiped away easily and prevents oil and fat from sticking to the surface, even in challenging shooting conditions. At the same time, the maintenance of the lens surface becomes easier.

Aperture ring

Aperture ring, designed to help users work intuitively

Dust and Splash Resistant Structure

This lens features a highly effective dust and splash resistant structure with special sealing at the mount connection, manual focus ring, zoom ring, and cover connection.

*Although this construction allows the lens to be used in light rain, it is not the same as being waterproof, so please prevent large amounts of water from splashing on the lens. It is often impractical to repair the internal mechanism, lens elements and electric components if they are damaged by water.

Mount Conversion Service available

Every single lens undergoes Sigma’s proprietary MTF measuring system