Sigma sets a new standard in
large-aperture mirrorless zoom lenses
The Sigma 28-70mm F2.8 DG DN | Contemporary redefines the standard zoom for mirrorless cameras by combining outstanding optical performance, an F2.8 constant aperture, and a lightweight and compact body. The design of the 28-70mm F2.8 DG DN | Contemporary is based on the existing 24-70mm F2.8 DG DN | Art, but with a focal range starting at 28mm, making the lens body significantly smaller and lighter while maintaining superb optical performance. It is the smallest and lightest lens in its class*. Remaining true to the Contemporary line’s core concept of maintaining an optimal balance between optical performance and lens size, this new optic delivers professional quality results in a body small enough to take on a casual outing.
In addition to prioritizing portability, Sigma’s optical engineers introduced a new combination of coatings and structural elements that make this standard zoom well-equipped for use in a wide range of shooting environments. Likewise, the latest production and manufacturing techniques were employed to ensure exceptionally high build quality.
The 28-70mm F2.8 DG DN | Contemporary introduces another fast, high-performance, large-aperture zoom lens to Sigma’s mirrorless line-up, offering a more compact alternative to the existing 24-70mm F2.8 DG DN | Art.
* As a standard zoom lens for full-frame mirrorless cameras with F2.8 brightness throughout the zoom range (Source: Sigma, as of February 2021)
| Camera Type | Mirroless |
|---|---|
| Corresponding Mount | L-Mount, Sony E-Mount |
| Sensor Format | Full-frame [DG] |
| Lens Construction | 12 groups, 16 elements (2 FLD elements, 2 SLD elements, 3 aspherical elements) |
| Angle of View | 75.4°~34.3° |
| Number of Diaphragm Blades | 9 (rounded diaphragm) |
| Minimum Aperture | F22 |
| Minimum Focusing Distance | 19 (W)-38 (T)cm / 7.5(W)-15 (T)in. |
| Maximum Magnification Ratio | 1:3.3 (W) – 1:4.6 (T) |
| Filter Size | φ67mm |
| Dimensions (Diameter × Length) | L-Mount：φ72.2mm×101.5mm / φ2.8in.×4.0in. |
| Weight | L-Mount：470g / 16.6oz. Sony E-mount：470g / 16.6oz. |
| Edition Number | C021 The three-digit code on the surface of the lens is to indicate the year the lens was first released. |
| Supplied Accessories | LENS HOOD LH706-01 |
| Mount / Product Barcode | L-Mount：00-85126-59269-1 Sony E-mount：00-85126-59265-3 |
| Camera Compatibility | LINK |
* L-Mount is a registered trademark of Leica Camera AG. |
Design based on Sigma’s Art line, with the same uncompromising optical performance
The optical design of the Sigma 28-70mm F2.8 DG DN | Contemporary is based on the 24-70mm F2.8 DG DN | Art, which is renowned for its outstanding optical performance throughout its zoom range. True to the Contemporary line’s core concept, the 28-70mm F2.8 DG DN | Contemporary was developed to offer the right balance of performance and portability, and as such, this large-aperture standard zoom delivers outstanding image quality that rivals Art line lenses in a body light enough for day-to-day use. Building on state-of-the-art technology, the 28-70mm F2.8 DG DN | Contemporary has an advanced optical design that includes three aspherical, two FLD, and two SLD elements. Despite using fewer elements in total than the 24-70mm F2.8 DG DN | Art, the design results in a thorough correction of axial chromatic aberration and sagittal coma aberration, which cannot be corrected in-camera, allowing users to create images that are uniformly sharp from the center to the edges of the frame. Along with its anti-ghosting design, the use of Super Multi-Layer Coating and Nano Porous Coating means well-controlled flare for high-contrast results in backlit conditions. It also features a water and oil repellant coating on the front side of the lens.
In short, the Sigma 28-70mm F2.8 DG DN | Contemporary combines all of the key optical features required of a large-aperture standard zoom lens, which are essential for photographing a wide variety of subjects in a range of shooting conditions.
Comparison of the two optimal solutions to standard zoom lenses with F2.8 brightness throughout the zoom range.
With the addition of the new 28-70mm F2.8 DG DN | Contemporary, Sigma now provides two optimal solutions of standard F2.8 zoom lens for mirrorless cameras ― the new 28-70mm F2.8 DG DN | Contemporary achieves remarkable portability and offers the same optical performance, as the existing 24-70mm F2.8 DG DN | Art which is for pro-use with the highest levels of performance throughout its focal range.
A 28–70mm lens with no compromise on optical performance or portability
28-70mm F2.8 DG DN | Contemporary
Focal length / F value : 28-70mm F2.8
Lens construction : 16 elements in 12 groups, with 2 FLD lens, 2 SLD lens and 3 Aspherical lenses
Minimum focusing distance, Maximum magnification ratio : 19-38cm, 1:3.3(W) – 1:4.6(T)
Coating : Super Multi-Layer Coating, Nano Porous Coating, Water and oil repellent coating
Mechanism : Focus Mode Switch
Dust and splash resistant : Dust and splash resistant structure (Applied to the mount only)
Hood : Petal-type lens hood
Filter size : φ67mm
470g*1, φ72.2mm×101.5mm
*1 for L-Mount
A pro-use lens with highest levels of performance throughout its focal range starting at 24mm at the wide-angle side
24-70mm F2.8 DG DN | Art
Focal length / F value : 24-70mm F2.8
Lens construction : 19 elements in 15 groups, with 6 FLD lens, 2 SLD lens and 3 Aspherical lenses
Minimum focusing distance, Maximum magnification ratio : 18-38cm, 1:2.9(W) – 1:4.5(T)
Coating : Super Multi-Layer Coating, Nano Porous Coating, Water and oil repellent coating
Mechanism : Focus Mode Switch, AFL button, Zoom Lock Switch
Dust and splash resistant : Dust and splash resistant structure*2
Hood : Petal-type lens hood with lock
Filter size : φ82mm
835g*1, φ87.8mm×122.9mm
*1 for L-Mount
*2 Although this construction allows the lens to be used in light rain, it is not the same as being waterproof.
A lightweight and compact body ―
ideal for day-to-day use
Being slightly less wide-angle than the 24-70mm F2.8 DG DN | Art has allowed a significant reduction in the size of the 28-70mm F2.8 DG DN | Contemporary lens body. In order to fit with the design concept of the Contemporary line, which balances performance with portability, the new lens features a simpler dust and splash resistant structure and smaller switches. This makes it the smallest and lightest lens in its class*.
The new lens features just one lightweight focusing element, which keeps the AF unit small. This, along with a quiet and fast stepping motor, makes for responsive and near-silent autofocus performance.
The 28-70mm F2.8 DG DN | Contemporary weighs in at 470g, and when attached to the Sigma fp, the entire setup is 890g. The supreme portability afforded by a camera system that weighs less than 1kg gives photographers a huge amount of freedom and flexibility to achieve their creative vision. It’s also a perfect combination for filmmakers looking for a high-performance, lightweight, easy-to-handle camera system that works well with a gimbal and other accessories.
A large-aperture, standard zoom lens that is light and small enough for casual outings, the 28-70mm F2.8 DG DN | Contemporary will open up new photographic possibilities for better and more creative results.
* As a standard zoom lens for full-frame mirrorless cameras with F2.8 brightness throughout the zoom range (Source: Sigma, as of February 2021)
Superb build quality with exceptional attention to detail that provides an exceptional user experience
With priority given to optimal portability, the body of the Sigma 28-70mm F2.8 DG DN | Contemporary consists primarily of lightweight parts. While conventional wisdom states that it is more difficult to ensure processing accuracy for plastic parts than metal parts, there has been no compromise whatsoever on build quality for the 28-70mm F2.8 DG DN | Contemporary. One reason for this is that it uses a type of polycarbonate called TSC (Thermally Stable Composite), which has a comparable level of thermal shrinkage to aluminum. This helps reduce differences between the thermal shrinkage of the metal and non-metal parts, ensuring stable levels of performance even in an environment with extreme temperature changes. The use of polycarbonates in the construction of zoom and focus rings can make their operation feel less premium, but with careful treatment to the precision of these parts and adjusting the movement with the lubricant appropriately, the rings offer a precise action with an exceptionally high-quality feel.
What allows us to achieve these precisely produced parts and such premium aesthetics is the impressive standard of manufacturing technology and rigorous quality control we have at the Sigma Aizu Factory.
The Sigma 28-70mm F2.8 DG DN | Contemporary offers a new and improved photographic experience for mirrorless users who require a fast aperture standard zoom lens. Its premium, intuitive build makes it as exciting to use the lens as it is to see the incredible images it can produce, inspiring you to start achieving your creative potential.
LENS CONSTRUCTION
MTF Chart
DIFFRACTION MFT
DIFFRACTION MFT
GEOMETRICAL MFT
GEOMETRICAL MFT
MTF CHART GUIDE
The MTF (Modulation Transfer Function) is one of the measurements for evaluating a lens’ performance, and it shows how faithfully the contrast of the subject can be reproduced on the image plane. The horizontal axis shows the image height (distance from the center of the image in mm) and the vertical axis shows the contrast value (maximum value is 1).
The closer the 10 line pairs/mm curve is to 1, the higher the contrast and clarity of the lens is, and similarly, the closer the 30 line pairs/mm curve is to 1, the better the resolution and sharpness of the lens is.
*The MTF chart depicts the result at the wide-open aperture.
*For mirrorless lenses that support distortion correction, the horizontal axis shows the image height equivalent to when an L-Mount lens is attached to a Sigma L-Mount camera with distortion correction applied. (The effect of distortion correction may differ depending on the mount and camera used.)
*The spatial frequency indicates the variation on the image plane before distortion correction is performed.
Inner focus system
To increase stability, this lens configuration uses movable internal lens elements that adjust focus without changing the length of the lens barrel.
HLA (High-response Linear Actuator)
HLA is Sigma’s proprietary linear motor. It drives the focus lens directly without going through gears or other mechanical parts, resulting in quiet, high-precision autofocusing.
Compatible with Lens Aberration Correction
Matching the optical characteristics of the lens, this function performs in-camera corrections of peripheral illumination, chromatic aberrations, distortion, and more, to further enhance image quality.
*Function available on supported cameras only. Available corrections or auto correction functionality may vary depending on the camera model.
*On cameras where lens aberration correction is controlled with ‘ON’ or ‘OFF’ in the camera menu, please set all aberration correction functions to ‘ON'(AUTO).
Nano Porous Coating
The super multi-layer coating is combined with Sigma’s unique coating technology “NPC (Nano Porous Coating)”. The lens has been designed to be less susceptible to strong incident light such as backlight.
“NPC (Nano Porous Coating)” incorporates porous silica as the coating material. The porous silica layer has nano-sized holes with air inside. Having holes of this size enables a large reduction in the refractive index, allowing the reflectance to be lowered more than conventional anti-reflective coatings. As a result, reflected light causing flares and ghosting is sharply reduced, achieving clear image quality.
Super Multi-Layer Coating
Sigma’s own Super Multi-Layer Coating suppresses flare and ghosting by preventing reflections with in the lens. All lenses in the current Sigma range feature this original technology. In digital cameras, flare and ghosting may also be caused by reflections between the image sensor and lens surfaces. Here too, Sigma’s Super Multi-Layer Coating is highly ef fective, assuring images of outstanding contrast.
Water and oil repellent coating
Incorporates a water and oil-repellent coating that allows water to be wiped away easily and prevents oil and fat from sticking to the surface, even in challenging shooting conditions. At the same time, the maintenance of the lens surface becomes easier.
Aperture ring, designed to help users work intuitively
Mounted with a de-click function for removing clicks by the aperture ring click switch, enabling seamless operations that are especially useful such as during video shooting.
A ring lock system to prevent from unintended movement of the aperture ring during shooting.
the AFL button can be assigned with various functions widens the range of operations available on the lens.
Using this swich, it is possible to switch the focus mode between AF and MF.
A focus movement method of interchangeable lenses for mirrorless cameras (DN lens) in relation to the rotational angle of the focus ring during manual focusing.
With “non-linear focus,” the amount of focal point movement varies depending on the focus ring rotational speed.
With linear focus, if the focus ring rotational angle is the same, the amount of focal point movement remains the same regardless of the focus ring rotational speed.
This lens features a highly effective dust and splash resistant structure with special sealing at the mount connection, manual focus ring, zoom ring, and cover connection.
*Although this construction allows the lens to be used in light rain, it is not the same as being waterproof, so please prevent large amounts of water from splashing on the lens. It is often impractical to repair the internal mechanism, lens elements and electric components if they are damaged by water.
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.
| Camera | SIGMA fp L |
|---|---|
| Shutter Speed | 1/8000s |
| Lens F Number | F2 |
| ISO | 100 |
| Focal Length | 37mm |
| Photographer | Aya Iwasaki |
| Camera | LEICA SL3 |
|---|---|
| Shutter Speed | 1/200s |
| Lens F Number | F1.8 |
| ISO | 100 |
| Focal Length | 45mm |
| Photographer | Jim Koepnick |
| Camera | Sony α7 IV |
|---|---|
| Shutter Speed | 1/500s |
| Lens F Number | F6.3 |
| ISO | 64 |
| Focal Length | 33.2mm |
| Photographer | Masami Tanaka |
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