Sigma AF 17-40mm F1.8 DC ART

Main Features

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 F. 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 table top 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
gimbal, 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 F. 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 front most 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.

Equipped with two AFL buttons
Equipped with two AFL buttons 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

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 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 to prevent accidental
changes to the aperture during shooting.