SIGMA 28-70mm F2.8
DG DN | Contemporary
• Kleinste en lichtste lens in zijn klasse
• Snelle, hoogwaardige zoomlens met groot diafragma
• Ontwerp gebaseerd op SIGMA's Art-lijn, met dezelfde compromisloze optische prestaties
• Een lichtgewicht en compacte body - ideaal voor dagelijks gebruik
• Superieure bouwkwaliteit met uitzonderlijke aandacht voor detail die zorgt voor een uitzonderlijke gebruikerservaring
• 'Made in Japan' vakmanschap
• 16 elementen in 12 groepen, met 2 FLD-elementen, 2 SLD-elementen en 3 asferische elementen
• Water- en olieafstotende coating (frontelement)
• Scherpstelmodusschakelaar
| Productlijn | Contemporary |
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| Youtube Videos | |
| Youtube Channel Link | https://www.youtube.com/watch?v=ne7UUBRLYqI&t |
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| Klevu Image | /p/r/product_img01_21.png |
| Lensconstructie | 16 elements in 12 groups |
| Lens Type | Standard |
| Sensor Size | Full Frame |
| Beeldhoek | 34.3° (FF), 22.9° (APS-C) |
| Aantal diafragmalamellen | 9 (Rounded diaphragm) |
| Minimaal diafragma | F22 |
| Minimale scherpstelafstand | 38cm |
| Maximale vergroting | 1:3.3 Wide |
| Afmetingen (diameter x lengte) | L-Mount ⌀ 72.2mm x 101.5mm |
| Gewicht (gram) | 470g |
| Filtermaat | 67mm |
| Edition number | C021 |
| Accessoires | Lens Hood (LH706-01) supplied. |
| EAN-code | L-Mount 085126592691 |
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
GEOMETRICAL MTF Chart
GEOMETRICAL MTF Chart
DIFFRACTION MTF CHART
DIFFRACTION MTF CHART
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.
Stepping Motor
The lens is capable of smooth, quiet and high-speed AF made possible by a stepping motor, as well as supports Face/Eye Detection AF and video AF.
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.
Focus Mode Switch
Using this swich, it is possible to switch the focus mode between AF and MF.
Linear focus / Non-linear focus (for L-Mount only）
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.
Mount with Dust and Splash Resistant Structure
The lens mount incorporates rubber sealing to protect the mount from dust and water drops.
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.
Rounded diaphragm
The polygonal shape of a conventional iris dia phragm causes out-of-focus light points to appear polygonal. A rounded diaphragm is designed to pro duce rounded out-of-focus light points when opened to near maximum aperture. This creates attractive bokeh effects in many situations, such as when pho tographing a subject against an out-of-focus surface of water from which light is being reflected.
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.
Lens construction: 16 elements in12 groups, with 2 FLD elements, 2 SLD elements and 3 aspherical elements
Compatible with high-speed autofocus
Support DMF, AF+MF
Petal-type lens hood
Compatible with SIGMA USB DOCK UD-11 (sold separately / for L-Mount only)
Designed to minimize flare and ghosting
Every single lens undergoes SIGMA’s proprietary MTF measuring system “A1”
9-blade rounded diaphragm
High-precision, durable brass bayonet mount
