Sigma 17-40mm F1.8 DC Art Lens for Canon RF Mount (214972)

The Sigma 17-40mm F1.8 DC Art is a groundbreaking APS-C zoom lens that redefines what a large-aperture zoom can achieve. Building on the legendary Sigma 18-35mm F1.8 DC HSMArt the world's first F1.8 zoom lens this next-generation successor expands the focal range to 17–40mm, reduces weight by over 30%, and incorporates video-first features including inner zoom, minimal focus breathing, and Sigma's HLA (High-response Linear Actuator) autofocus system. The result is an ultra-versatile wide-to-normal zoom delivering prime-level optical performance at every focal length and every aperture setting.

Constant F1.8 Aperture Across the Entire Zoom Range

• F1.8 Throughout: Maintain a wide, constant maximum aperture from 17mm to 40mm — ideal for low-light shooting, subject separation, and beautiful bokeh at any focal length.
• Prime-Like Rendering: High-precision optical design achieves exceptional sharpness, contrast, and tonal rendering even wide open at F1.8, rivaling the best prime lenses.
• APS-C Equivalent Range: Provides a 27.2–64mm equivalent focal length on Canon RF-S APS-C bodies (1.6x crop factor) — covering wide-angle to portrait reach in a single lens.

Exceptional Optical Design

• 17 Elements in 11 Groups: Advanced optical construction with 4 SLD (Special Low Dispersion) glass elements and 4 aspherical elements.
• Axial Chromatic Aberration Correction: Emphasis on correcting axial chromatic aberration and sagittal coma flare for outstanding sharpness at F1.8.
• Super Multi-Layer Coating: Sigma's proprietary coating, developed with advanced simulation technology, minimizes flare and ghosting for rich, high-contrast results in all lighting conditions.
• 11-Blade Rounded Diaphragm: Produces smooth, natural background blur (bokeh) throughout the aperture range.

Video-Optimized Performance

• Inner Zoom Mechanism: The lens maintains a constant overall length when zooming or focusing — ideal for gimbal use and reducing dust/splash ingress.
• Minimal Focus Breathing: Changes in angle of view during focus shifts are suppressed, enabling smooth, cinematic focus pulls without jarring reframing.
• HLA (High-response Linear Actuator) AF: Fast, quiet, and precise autofocus driven by a linear actuator motor — perfectly suited for single-operator run-and-gun shooting and vlogging.
• Control Ring (Canon RF): The Canon RF Mount version features a control ring (assignable via camera menu) in place of the aperture ring found on other mount versions.
• Two AFL Buttons: Positioned on the side and top of the lens barrel for easy access in both landscape and portrait orientations; functions are assignable via camera menu.

Build Quality & Handling

• Dust- & Splash-Resistant Construction: Sealed design protects against dust and moisture for reliable use in challenging outdoor environments.
• Water- & Oil-Repellent Front Element Coating: The frontmost element is treated to repel water and oil, maintaining image clarity in the field.
• Compact & Lightweight: At 560g / 19.8 oz and 67mm filter thread — one size smaller than the predecessor's 72mm — the 17-40mm Art offers outstanding portability for its aperture class.
• Over 30% Lighter Than Predecessor: Significantly more portable than the 18-35mm F1.8 DC HSM | Art while delivering a wider zoom range and improved feature set. 

What's in the Box

• Sigma 17-40mm F1.8 DC Art Lens (Canon RF Mount) — 214972
• Lens Hood LH728-02
• Front Cap LCF-67 IV
• Rear Cap LCR III
• Protective Pouch