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24-70mm F2.8 DG OS HSM Sigma Art Lens
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    Specs

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  • 18 Replies sorted by
  • PR

    SIGMA 24-70mm F2.8 DG OS HSM

    Top-level performance optimized for the era of ultra-high-megapixel cameras

    The large-diameter standard zoom ideal for today’s ultra-high-megapixel digital cameras

    What photographers demand from the 24-70mm F2.8 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 all-new 24-70mm F2.8 lens from SIGMA delivers the performance and functionality that help pros succeed in news, nature, and many other fields of photography.

    Key features

    Outstanding optical performance

    Three SLD (Special Low Dispersion) 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 via aperture control, The optical system also minimizes distortion, which can be particularly evident in wide-angle shots, resulting in excellent optical performance throughout the zoom range.

    A 24-70mm F2.8 lens that meets the high standards of the Art line

    SIGMA has continuously pioneered 24-70mm F2.8 lenses that are a step ahead of the times. The first model of this specification, SIGMA 24-70mm F2.8 EX DG ASPHERICAL DF, launched in 2001. Representing the fourth generation of the family, the new SIGMA 24-70mm F2.8 DG OS HSM | Art accomplishes a challenging feat in optical design: incorporating optical stabilizer functionality in a large-diameter standard zoom. By leveraging all of its design and manufacturing expertise, SIGMA has ensured that this new lens fulfills the uncompromising requirements of the Art line for image and build quality.

    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 first products to feature this technology were the SIGMA 12-24mm F4 DG HSM | Art and SIGMA 14mm F1.8 DG HSM | Art, which both incorporated a large ⌀80mm aspherical lens as their front lens element. Building on the success of these predecessors, the SIGMA 24-70mm F2.8 DG 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 F2.8 DG HSM | Art to deliver a very natural and smooth bokeh effect, without the visible concentric rings that afflict typical aspherical lens elements.

    OS functionality and newly designed HSM for success on any shoot

    Designed for advanced utility in a wide variety of situations, the optical stabilizer (OS) offers a powerful stabilization effect. The newly designed large hypersonic motor (HSM) offers 1.3 times the torque of its predecessor and exceptionally stable performance even at lower speeds.

    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 F2.8 DG 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.

    Other features

    • Mount with dust- and splash-proof design
    • Nikon electromagnetic diaphragm mechanism included
    • Fast AF with full-time manual focus
    • Compatible with Mount Converter MC-11
    • Available SIGMA USB DOCK (Makes customization and flexible adjustment possible)
    • Available Mount Conversion Service (Allows use with another camera body)
    • Rounded diaphragm
    • Designed to minimize flare and ghosting
    • High-precision, durable brass bayonet mount
    • Evaluation with SIGMA’s own MTF measuring system “A1”
    • Made in Japan (With outstanding craftsmanship)
    • The lens barrel is engraved with the year of release
  • http://www.sigma-global.com/en/lenses/cas/product/art/a_24_70_28/

    P.S. Weight: TBD - what is this? don't they have a sample to put on a scale?

  • "Nikon electromagnetic diaphragm mechanism included"

    This technology replaces the mechanical iris lever in the lens with electronic control. That makes the lens INCOMPATIBLE with all mechanical speedboosters and MFT adapters. Note that Sigma's Mount Converter MC-11 works only on Sony cameras. In other words, you cannot currently adjust the aperture of the Nikon version of this lens on an MFT camera (because no one makes electronic adapters for Nikon lenses). The Nikon version of the Tamron 85mm f1.8 SP lens is likewise incompatible with MFT cameras.

  • I need a side by side comparison with their old 24-70

  • Review

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    24mm

    Centre sharpness remains high through from f/2.8 to f/11, with f/16 and f/22 being adversely affected by diffraction. The edges aren't quite as sharp as the centre, with f/4 to f/11 producing the sharpest results.

    70mm

    Centre sharpness remains high through from f/4 to f/11, with f/16 and f/22 being adversely affected by diffraction. The edges aren't quite as sharp as the centre, with f/5.6 to f/11 producing the sharpest results.

    http://www.photographyblog.com/reviews/sigma_24_70mm_f2_8_dg_os_hsm_review/

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  • Review

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    Sigma’s new lens is sharp in the center throughout the zoom-range with 35mm a little softer than the rest. The APS-C-corner is soft at the short end but sharpens up around 50mm focal length. And the FF/FX-corner is outright mushy wide open at the short end and only a little better towards the longer end.

    https://www.cameralabs.com/sigma-24-70mm-f2-8-os-art-review/

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  • New firmware

    It has corrected the phenomenon that the Manual Override (MO) function will be disabled after adjusting the settings of focus mode switch on SIGMA Optimization Pro (Macintosh ver.).

  • Review

    24mm

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    At wide end central sharpness is off to an excellent start from f/2.8 all the way through to f/8. The standard is still very good at f/11 and f/16, becoming soft by f/22 as diffraction really takes hold. Edges are quite good from f/2.8 to f/5.6, excellent at f/8, very good at f/11, thereafter falling to good at f/16 and quite soft at f/22.

    35mm has excellent central sharpness from f/2.8 to f/8 and very good at f/11 and f/16. f/22 is only fairly sharp. The edges are very good at f/2.8, excellent from f/4 to f/8, very good at f/11 and f/16 and again only fair at f/22.

    50mm sees excellent central sharpness from f/2.8 to f/5.6. This remains very good from f/8 to f/16, softening at f/22 to fair levels. The edges are very good at f/2.8 and f/4, excellent at f/5.6, very good from f/8 to f/16 and just fair at f/22.

    70mm sees excellent central sharpness at f/2.8 and f/4, very good performance at f/5.6 and f/8 and then just fair results from f/11 to f/22. The edges are just fairly sharp all the way through the range, from f/2.8 to f/22, peaking at f/4 but never becoming stellar.

    70mm

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    https://www.ephotozine.com/article/sigma-24-70mm-f-2-8-dg-os-hsm-art-lens-review-31507

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