The 17-70mm F2.8-4 DC Macro HSM OS is the first lens in the Contemporary line of Sigma’s Global Vision.
The Sigma 17-70mm F2.8-4 was designed to be the ideal all-purpose lens for APS-C DSLRs. With a versatile focal length and macro capability, the 17-70mm F2.8-4 is also equipped with a Hyper Sonic Motor (HSM) and an Optical Stabilizer (OS) for superior image quality.
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| Feature | Description |
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| 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. |
| HSM (Hyper Sonic Motor) | The Hyper Sonic Motor (HSM) is an original Sigma development that uses ultrasonic waves to drive the autofocus mechanism. Its extremely quiet operation helps avoid disturbing photographic subjects. High torque and speed assure rapid autofocus response. Sigma uses two types of HSM: ring HSM and micro HSM. The Ring HSM configuration permits manual fine tuning of focus (manual override) by turning the focusing ring after autofocus is complete. |
| Rounded diaphragm | The polygonal shape of a conventional iris diaphragm causes out-of-focus light points to appear polygonal. A rounded diaphragm is designed to produce rounded out-of-focus light points when opened to near maximum aperture. This creates attractive bokeh effects in many situations, such as when photographing a subject against an out-of-focus surface of water from which light is being reflected. |
| OS (Optical Stabilizer) function | Sigma’s original OS (Optical Stabilizer) function uses sensors inside the lens to detect any motion, then moves specific lens elements in order to effectively minimize blur caused by such movement. Owing to the stabilized image in the viewfinder, it is possible to fine-tune composition and ensure accurate focusing. |
| 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, Sigma lenses feature up to three types of exclusive low-dispersion glass: ELD (Extraordinary Low Dispersion), SLD (Special Low Dispersion) and FLD (“F” Low Dispersion). FLD glass offers ultra-low dispersion with high transmittance and the anomalous dispersion characteristics of fluorite. Proper deployment of these glass types and power distribution gives Sigma lenses superior image rendition without residual chromatic aberration. |
| Lens construction | 16 elements in 14 groups, with 2 FLD glass, 1 SLD glass, and 3 aspherical lenses |
| Compatibility | Compatible with Sigma USB DOCK UD-01 (sold separately) |
| Flare and Ghosting Minimization | Designed to minimize flare and ghosting |
| 7-blade rounded diaphragm | Provides attractive bokeh effects and smoother light points |
| Durable brass bayonet mount | High-precision, durable brass bayonet mount for enhanced strength and longevity |
| Specification | Details |
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| Camera Type | DSLR |
| Corresponding Mount | SIGMA SA-mount, Canon EF mount, Nikon F mount, Sony A-mount, Pentax mount |
| Sensor Format | APS-C [DC] |
| Lens Construction | 16 elements in 14 groups |
| Angle of View | 79.7° – 22.9° |
| Number of Diaphragm Blades | 7 (Rounded diaphragm) |
| Minimum Aperture | F22 |
| Minimum Focusing Distance | 22cm |
| Maximum Magnification Ratio | 1:2.8 |
| Filter Size | φ72mm |
| Dimensions (Diameter × Length) | φ79mm × 82mm *The length of a lens is measured from the filter surface to its mount. |
| Weight | 465g |
| Edition Number | C013 The three-digit code on the surface of the lens is to indicate the year the lens was first released. (Since it is different from the year of manufacture, the release year and edition number may not match depending on the mount.) |
| Supplied Accessories | LENS HOOD LH780-03, FRONT CAP LCF-72mm III |
| Mount / Product Barcode | SIGMA SA-mount: 00-85126-88456-7 (discontinued) Canon EF mount: 00-85126-88454-3 (discontinued) Nikon F mount: 00-85126-88455-0 (discontinued) Sony A-mount: 00-85126-88462-8 (discontinued) Pentax mount: 00-85126-88461-1 (discontinued) |
| Camera Compatibility | LINK |
| Notes | All figures calculated by Sigma SA mount. * Vignetting will occur if the lens is used with image sensor larger than APS-C size or 35mm SLR, and APS Film SLR cameras. To find the 35 mm camera equivalent focal length, multiply the DC lens focal length by the “crop factor” (digital multiplier) of 1.5, 1.6 or 1.7, depending on the brand of DSLR camera on which the lens will be used. To find which DC lens is equivalent to a full frame lens, divide the focal length of the full frame lens by the same crop factor. * Sony A and Pentax mounts are not incorporated with OS function. * AF will not function with Pentax ist* series and K100D DSLR cameras that do not support HSM. |
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