Sigma 24-70mm f/2.8 ART DG OS HSM Zoom Lens (for Nikon)
Optimized for the era of ultra-high-megapixel cameras.
The Sigma 24-70mm f/2.8 ART DG OS HSM Zoom Lens is a premium workhorse zoom lens designed for the latest high-megapixel DSLRs. A constant aperture of f/2.8 through the zoom range makes this a highly versatile tool, and a brand new Optical Stabilization (OS) system helps compensate for camera shake. Though a common focal length, the Sigma 24-70mm Art brings a new level of usability and durability featuring a rugged metal barrel and an emphasis on image quality.
Building off the experience from the 12-24mm Art, the aspherical elements used in the 24-70mm f/2.8 OS Art undergo a highly precise level of polishing, producing elements thicker in the center than on the edges. This process creates stunning image quality and beautiful circular bokeh. Like each and every Global Vision Lens, the Sigma 24-70mm f/2.8 DG HSM OS Art is handcrafted at Sigma's single factory in Aizu, Japan and undergoes individual evaluation before leaving the facility.
The performance and functionality that pros in all fields require:
What photographers demand from the 24-70mm f/2.8 specification is much more than outstanding image quality. They want all the features that make this a go-to lens for a wide range of photographic opportunities, including optical design ideal for the latest ultra-high-megapixel digital cameras, hypersonic motor (HSM) for high-speed autofocus, optical stabilizer (OS) with powerful stabilization effect, dust- and splash-proof mount with rubber sealing, and a metal barrel for a stable, rigid feel. This 24-70mm f/2.8 lens from Sigma delivers the performance and functionality that help pros succeed in news, nature, and many other fields of photography.
Art line delivers high-level artistic expression:
Sigma is organizing all its interchangeable lenses into three product lines: Contemporary, Art, and Sports, each with a distinctive concept. Designed with a focus on sophisticated optical performance and abundant expressive power, Sigma's Art line lenses deliver high-level artistic expression. Offering astonishing rendering performance that meets the highest standard, they are perfect for landscapes, portraits, still-lifes, close-ups, and casual snaps. They are made for the kind of photography that unleashes the inner artist. A powerful ally in every genre of photography, Sigma's Art line lenses excel both in the studio for formal works and outdoors for impressive shots of architecture, starry skies, and many other scenes.
Outstanding optical performance:
Three SLD glass lens elements and four aspherical lens elements help minimize optical aberrations. To ensure outstanding image quality from the center to the edges of the photograph, the optical system minimizes coma, which causes points of light to streak, and transverse chromatic aberration, which cannot be corrected by adjusting the aperture. The optical system also minimizes distortion, which can be particularly evident in wide-angle shots, resulting in excellent optical performance throughout the zoom range.
Bokeh that is a cut above:
At wide-open aperture, this lens offers outstanding photographic expression. The area in focus is extremely sharp, while the background exhibits a beautiful bokeh effect with only slight spherical aberration. Since large-diameter zoom lenses are often used at wide-open aperture, Sigma has paid close attention to the shape of the bokeh, aiming for perfect circularity.
Incorporating advanced aspherical lens processing technology:
Aspherical lenses necessitate refined expertise in the design and manufacturing of advanced, high-performance lenses. Sigma's representative products to feature this technology were the Sigma 12-24mm f/4 DG HSM Art and Sigma 14mm f/1.8 DG HSM Art, which both incorporated large 80mm aspherical lenses as their front lens element. Building on the success of these predecessors, the Sigma 24-70mm f/2.8 DG OS HSM Art incorporates an aspherical lens element that helps achieve extremely high resolution. This element is much thicker at the center than the edges, and forming its unusual shape is a feat of manufacturing technology. Moreover, Sigma processes the surface of this aspherical lens element with ultra-precise tolerances that are measured in hundredths of a micrometer. This extremely fine surface allows the Sigma 24-70mm f/2.8 DG OS HSM Art to deliver a very natural and smooth bokeh effect, without the visible concentric rings that afflict typical aspherical lens elements.
Exclusive low-dispersion glass:
The degree to which light is refracted by glass depends on the light's wavelength. This fact causes different colors of light to focus at slightly different points. The result is chromatic aberration, the color fringing that is particularly noticeable in telephoto lenses. Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. Yet residual chromatic aberration known as "secondary spectrum" may still remain. To minimize this secondary spectrum, which can be a serious issue with conventional lenses, Sigma lenses feature up to three types of exclusive low-dispersion glass offering superior performance: ELD (Extraordinary Low Dispersion), SLD (Special Low Dispersion) and FLD ("F" Low Dispersion). In particular, FLD glass offers ultra-low dispersion in combination with high transmittance and the anomalous dispersion characteristics of fluorite. Meticulous deployment of these types of exclusive low-dispersion glass and optimization of power distribution gives Sigma lenses superlative image rendition undiminished by residual chromatic aberration.
Designed to minimize flare and ghosting:
From the start of the design process, Sigma measured flare and ghosting to establish an optical design that is resistant to strong incidental light sources such as backlight. At the prototyping stage, Sigma used not only simulations but actual photographic experiments to assess flare and ghosting under multiple criteria, identify the causes of these issues under a wide range of situations, and take measures to mitigate them. In addition, Sigma's Super Multi-Layer Coating helps further reduce flare and ghosting and provide sharp, high-contrast images even in backlit conditions.
|WITH SUPER MULTI-LAYER COATING
||WITHOUT SUPER MULTI-LAYER COATING
Incorporating the OS function for success on any shoot:
Designed for advanced utility in a wide variety of situations, the optical stabilizer (OS) offers a powerful stabilization effect.
Newly designed HSM for fast AF performance:
The newly designed hypersonic motor (HSM) offers 1.3 times the torque of its predecessor. Even at low speeds, it offers exceptionally stable performance.
Fast AF with full-time manual focus:
Full-time manual focus function allows the lens to be switched to manual focus simply by rotating the focus ring.
Lens barrel designed for high rigidity:
Since large-diameter standard zoom lenses tend to serve as a go-to lens and see frequent use, the Sigma 24-70mm f/2.8 DG OS HSM Art is designed to stand up to the challenging shooting environments that pros encounter. To this end, the lens barrel contains a large amount of metal, while the external moving parts feature thermally stable composite (TSC), which is resistant to thermal expansion and contraction. This structure contributes not only to the outstanding optical performance of the lens but also to its high rigidity and confidence-inspiring build quality.
Nikon electromagnetic diaphragm mechanism included:
The Nikon mount version of this lens includes an electromagnetic diaphragm mechanism that allows it to receive the appropriate signals from the camera body. This feature ensures precision diaphragm control and stable Auto Exposure (AE) performance during continuous shooting.
The 9-blade rounded diaphragm creates an attractive blur in the out-of-focus areas of the image.
Mount with dust- and splash-proof design:
Since the area of the lens most vulnerable to dust and other foreign bodies is the mount, rubber sealing helps provide peace of mind. In addition, the front lens element features a water- and oil-repellent coating that helps the lens perform well in the rain, near water, and in other challenging conditions.
High-precision, rugged brass bayonet mount:
The brass mount combines high precision with rugged construction. Its treated surfaces and enhanced strength contribute to the exceptional durability of the lens.
Sigma USB Dock for Sigma GLOBAL VISION lenses (optional):
With the optional Sigma USB Dock, you can update your lens firmware and adjust the focus position and other settings. Simply connect the lens to the Sigma USB Dock and the dock to a computer to use the dedicated Sigma Optimization Pro software and perform various types of customization and adjustment.
Available for the Mount Conversion Service:
Sigma can convert the current lens mount internal components, allowing you to continue using your favorite Sigma lenses from the new product lines with a different camera body. Thanks to this service, you can use a favorite lens for many years to come, unrestricted by your original choice of camera system.
Evaluation with Sigma's own MTF measuring system: A1:
Sigma has developed its own proprietary MTF measuring system (A1) using 46-megapixel Foveon direct image sensors. Even previously undetectable high-frequency details are now within the scope of quality control inspections. All Sigma 24-70mm f/2.8 DG OS HSM Art lenses are checked using this A1 system before they are shipped.
Ultra-high precision and quality -- all made in Japan:
With only a few minor exceptions, all of Sigma's manufacturing, including molds and parts, takes place under a single integrated production system in Japan. Sigma's sophisticated products have satisfied professionals and lovers of photography all over the world because the manufacturing is based on genuine craftsmanship, underpinned by the passion and pride of their experts.