Sigma 17-40mm f/1.8 DC Art Lens (L-Mount)

Sigma presents the 17-40mm f/1.8 DC Art Lens for APS-C mirrorless cameras, offering a constant f/1.8 aperture across the zoom range. Delivering optical quality comparable to prime lenses and optimized for video use, this lens covers a versatile wide-to-normal focal length, enabling a more compact setup without compromising image excellence.

Design and Performance

The lens comprises 17 elements arranged in 11 groups, including four aspherical and four Special Low Dispersion elements designed to reduce flare, ghosting, and various aberrations. This construction delivers optical performance on par with or surpassing other Sigma Art lenses, such as the 18-35mm f/1.8 DC HSM Art. Its 11-blade rounded diaphragm enhances sharpness and produces a smooth, pleasing bokeh when shooting wide open. With a constant f/1.8 aperture and a 28cm minimum focusing distance throughout the zoom range, it achieves a maximum magnification of 1:4.8 at 40mm, offering increased depth of field and flexibility in close-up compositions.

Video Production

Engineered for video production, this lens combines a bright f/1.8 aperture with a versatile wide-to-normal zoom range, making it well-suited for solo operators and run-and-gun shooting. Its internal zoom mechanism keeps the lens length constant, facilitating stable gimbal balance. The design also minimizes focus breathing, ensuring smooth transitions throughout the zoom range. Sigma’s high-speed linear actuator delivers quiet, precise autofocus, while a textured control ring enhances manual focusing control.

Additional Features

• Two AFL buttons
• Focus mode switch
• Water- and oil-repellent coating on front element
• Dust- and splash-resistant design
• Durable brass bayonet mount