Sigma 18-35mm f/1.8 DC HSM Art Lens for Canon EF

Sigma 18-35mm f/1.8 DC HSM Art Lens (Canon EF-Mount)
Revolutionary Constant f/1.8 APS-C Zoom – Good Condition with Minor Signs of Wear
The Sigma 18-35mm f/1.8 DC HSM is a groundbreaking, flagship Art-series zoom lens engineered for APS-C-format Canon EF-mount DSLRs (and mirrorless systems via adapters). Breaking conventional design boundaries, it stands as one of the first zoom lenses to offer a remarkably bright, constant f/1.8 maximum aperture throughout its entire focal range. Delivering a 28.8–56mm equivalent field of view, this optic effortlessly spans wide-angle to normal perspectives. It combines a highly sophisticated optical arrangement—packed with five Special Low Dispersion (SLD) glass elements and four aspherical surfaces—with a swift Hyper Sonic Motor (HSM) for whisper-quiet autofocusing. Please note: This lens is in good functional condition, but exhibits some interior dust and a minor scratch on the front element that does not affect image quality.

Key Features & Engineering
World-First Constant f/1.8 Zoom: The ultra-bright, constant f/1.8 maximum aperture delivers unparalleled low-light performance across the entire zoom range and provides dramatic, prime-like depth-of-field control.

Sigma Art-Line Optical Precision: Incorporates five Special Low Dispersion (SLD) elements to eliminate color fringing and chromatic aberrations, alongside four aspherical elements to significantly limit geometric distortion and spherical aberrations.

Super Multi-Layer Coating: Optical surfaces are treated with Sigma’s premium Super Multi-Layer Coating to suppress surface flare and ghosting, preserving rich image contrast and absolute color neutrality when shooting into harsh backlight.

High-Speed Hyper Sonic Motor (HSM): Powered by an integrated Hyper Sonic Motor and an internal focusing layout that ensures fast, silent, and pinpoint autofocus tracking. Full-time manual focus override is supported by simply twisting the rubberized focus ring at any moment.

Thermally Stable Composite (TSC) Build: Constructed using an advanced TSC material for precise internal alignment across wide temperature variations. Outfitted with a heavy-duty, machined brass bayonet mount for enhanced rigidity and mounting accuracy.

9-Blade Rounded Diaphragm: Features a rounded nine-blade aperture geometry that yields a smooth, creamy, and visually striking background blur (bokeh).

Sigma USB Dock Compatibility: Fully compatible with the optional Sigma USB Dock, allowing users to hook the lens up to a computer to update internal firmware and fine-tune individual autofocus calibration metrics.

Item Condition & Diagnostic Notes
Mechanical & Autofocus State: Good overall condition. The internal zoom mechanism, manual focus ring damping, and electronic HSM autofocus motor are fully responsive, stable, and operate flawlessly on the bench.

Optical Discrepancies:

There is a small, light scratch on the front glass element.

Internal dust particles are present between the internal lens groups from normal field deployment.

Performance Impact: Because these optical blemishes are minor and positioned away from the focal plane, they do not show up in final images, degrade resolving power, or cause abnormal flare under standard testing conditions.

Included Accessories & Exclusions: This lens is being sold bare. It does NOT include a front lens cap, a rear lens cap, or the original bayonet lens hood.

Technical Specifications
Lens Classification: High-Speed Standard Zoom (Sigma Global Vision Art Series)

Lens Mount Type: Canon EF Mount (APS-C Sensors Only)

Focal Length: 18 – 35mm (35mm Equivalent: 28.8 – 56mm)

Maximum Aperture: f/1.8 (Constant)

Minimum Aperture: f/16

Optical Architecture: 17 Elements in 12 Groups (5 SLD, 4 Aspherical)

Autofocus Motor: HSM (Hyper Sonic Motor) with Internal Focusing

Aperture Blades: 9 (Rounded)

Filter Thread Size: 72 mm

Dimensions (Diameter x Length): Approx. 3.1 x 4.8 inches / 78.0 x 121.0 mm

Weight: 28.6 oz / 810 g