The world’s only full-frame zoom with an F1.8 aperture
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£1299
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£1299The SIGMA 28-45mm F1.8 DG DN | Art is the world’s first full-frame zoom lens with a constant maximum aperture of F1.8, delivering sharpness and clarity comparable to that of a prime lens.
Already the pioneer of unique, large-aperture zoom lenses including the SIGMA 18-35mm F1.8 DC HSM | Art and the SIGMA 24-35mm F2 DG HSM | Art, SIGMA introduces another fast, portable and versatile tool to its Art lineup.
In addition to its unprecedented brightness, the SIGMA 28-45mm F1.8 DG DN | Art delivers sharpness and clarity comparable to that of a prime lens throughout its entire zoom range. Also equipped with fast and precise AF and superior operability, this innovative optic turns a new page in the history of zoom lenses and their creative possibilities. It is a lens that will inspire full-frame film-makers, while bringing unparalleled versatility to stills photographers.
The lens’ fast F1.8 aperture allows full-frame camera users to expose hand-held in low light and produce beautiful bokeh, while enjoying the flexibility of a zoom. This unique optical achievement has been created through SIGMA’s accumulated optical design experience and advanced production technology at the company’s sole production base in Aizu, Japan.
By rights, such a fast zoom should be big and heavy, but while the lens’s rigidity and durability protect its sophisticated optical design, this is achieved at a weight of less than 1kg. What’s more, this reliable photographic tool uses a versatile filter size of φ82mm, meaning no compromise in portability or convenience.
Towards the rear of the barrel is an aperture ring, which can be de-clicked for stepless aperture changes. When put into Auto, aperture is controlled by the camera. A lock switch allows users to lock the ring in Auto or Manual so it’s not accidentally knocked into a different setting.
To reduce flare and ghosting in bright sun, and to help protect the front element from damage if dropped, the lens has a robust petal-type lens hood with lock button. A rubberised ring on the hood makes for easier removal and fitting.
The durable brass mount is surrounded by a rubber seal to help keep out dust and moisture, and there are weather resistant seals throughout the lens body.
Precision brass mount with seal
Protects against dust and moisture.
Aperture ring
With a click/de-click switch and a lock switch.
Zoom ring
A large, rubberised ring with a smooth action. The zoom is internal.
Focus ring
A large, rubberised ring with a smooth action. Focusing is internal.
Petal-type lens hood
Lockable hood that cuts down on flare while limiting vignetting.
Focus Mode switch
For changing between AF and MF.
AFL button
Customisable depending on camera body.
Aperture Click switch
Clicks or de-clicks the aperture ring.
TSC construction
Made from a strong and light polycarbonate that behaves in a similar way to aluminium.
A range of controls on the lens include an AF/MF switch, two customisable AFL switches, and switches to de-click and lock the aperture ring.
The lens is constructed from Thermally Stable Composite, a strong and light polymer that has a similar thermal expansion rate to the interior aluminium parts. This ensure that the lens behaves in a uniform and reliable way regardless of the temperature.
The 28-45mm F1.8 DG DN | Art uses SIGMA’s High-response Linear Actuator motor to control the focus group of lens elements. More powerful than a stepping motor, it ensures extremely rapid AF. It’s also very accurate and near-silent, and works perfectly with focus tracking systems.
The other advantage the powerful HLA motor brings with it is that it can move larger and heavier focusing groups than a stepping motor, which unlocks the door more advanced optical designs, and therefore sharper results.
With each optical aberration meticulously corrected throughout the zoom range, the SIGMA 28-45mm F1.8 DG DN | Art rivals prime lenses for clarity and definition. Thanks to its advanced coatings, the lens produces clear images, even in backlit environments, while focus breathing is thoroughly suppressed, bringing expressive power to film-makers and photographers.
Through the effective arrangement of 5 SLD elements and 3 aspherical elements, aberrations are rigorously corrected. Axial chromatic aberration, which is particularly noticeable with large-aperture lenses, has been thoroughly suppressed, and the lens delivers clear images with minimal coloration, from sharply focused details to large, smooth bokeh.
The minimum focusing distance is a constant 30cm across the entire zoom range, with a maximum magnification ratio of 1:4 at the telephoto end, providing excellent close-up shooting capabilities. As well as offering precise focus in confined spaces, the lens can therefore be used close to a subject without affecting sharpness when using the zoom.
In addition to a dust- and splash-resistant body, which has rubber seals around the focus, zoom and aperture rings, as well as the buttons and switches, the frontmost surface of the lens is coated with a water- and oil-repellent coating so that it can be used safely even in harsh outdoor environments.
Employing an inner zoom mechanism, the overall length of the lens remains constant when the focal length or focus distance changes. This means the lens is easy to use when shooting hand-held, highly stable when mounted on a tripod or gimbal, and more resistant to dust and water contamination.
Find out exactly what features are included with the full-frame 28-45mm in this 2m30s video.
Get the thoughts of professional UK-based photographer and film-maker, Jack Redgate, and find out why the 28-45mm is one of his go-to lenses for both stills and video.
SIGMA has two highly versatile zoom options starting at 28mm – the 28-45mm F1.8 and the 28-70mm F2.8. The 28-45mm boasts a constant F1.8 aperture, an aperture ring with de-click and lock functions, better weather resistance, internal zoom and AFL buttons. However, the 28-70mm has a wider focal range, is less than half the weight and has a smaller price-tag. Both are very capable lenses for both stills and video and offer similar optical performance.
960g
in weight
151.4mm
in length
470g
in weight
101.5mm
in length
All Sigma cameras and lenses are designed, manufactured and assembled at our sole factory at Aizu in Japan. This domestic production model is unusual in today’s industry, with most imaging companies opting to outsource to other countries to reduce costs. But SIGMA believes that keeping virtually all manufacturing, processing and assembly in Aizu is essential for creating innovative, carefully thought-out and impeccably constructed products that meet the high standards demanded by professional photographers and film-makers around the world.
Sigma chose Aizu as its main production base in the early 1970s. Situated at the base of Mount Bandai in the Fukushima Prefecture, about four hours’ drive north of Tokyo, Aizu has an abundance of very clean water from mountain streams, which is essential for grinding and polishing lenses. Sigma’s founder, Michihiro Yamaki, was also drawn to this area for its workforce, who have a reputation for their craftsmanship, work ethic and attention to detail. Mr Yamaki’s son, Kazuto Yamaki, now the owner and CEO of SIGMA Corporation, has the same unwavering commitment to keeping production in Japan.
Today Sigma’s factory is more than 50,000 square feet in size, and packed full of some of the most advanced optical manufacturing technology in existence. So when you buy a Sigma camera or lens you can be sure that virtually every single component part has been manufactured and assembled by SIGMA, in Japan, with the greatest level of care and attention. We hope you enjoy using our products.
If you want to see how a particular SIGMA lens or camera performs, why not test drive it with our SIGMA Select hire service. Available for selected SIGMA lenses, short-term loans are free of charge (including shipping), with a small fee if you want to test it for longer. Refundable deposit required. Subject to availability.
Lens construction
18 elements in 15 groups
Angle of view
75.4-51.3°
Number of diaphragm blades
11 (rounded diaphragm)
Minimum aperture
F16
Minimum focusing distance
30cm
Maximum magnification ratio
1:4 (at 45mm)
Filter thread
82mm
Dimensions (diameter x length)
ø87.8mm × 151.4mm
Weight
960g
Corresponding AF mounts
L-Mount | Sony E
L-Mount barcode
00-85126-612696
Sony E barcode
00-85126-612658
Specifications are for L-Mount
This product is currently available to pre-order.
Full payment will be taken upon placing your pre-order and will be dispatched on the product launch date, subject to stock availability.
You can cancel your pre-order at any time by contacting us and providing your order number:
info@sigmauk.com
01707 329 999
A special coating applied to the front element to help repel water and oil.
This suppresses flare and ghosting by minimising reflections within the lens, ensuring punchy, high-contrast results. All lenses in the current Sigma range feature this technology.
This describes the degree to which a lens can magnify an in-focus subject. The ratio shows the relationship between the size of the projection of a subject on the camera’s sensor (the left number) and its actual size in reality (the right number).
Internal focus or an inner focus system means the lens configuration uses movable internal lens elements that adjust focus without changing the length of the lens barrel. This helps keep the centre of gravity of the lens more constant when changing focus.
The lens has an image circle large enough to be used on a full-frame camera. It can also be used on cameras with a smaller ‘crop’ sensor, provided the mount is compatible.
The lens has a filter thread around the front element onto which filters and filter holders can be attached.
The mount is the part of the lens that attaches to the camera body. A coated brass mount is used for strength, and is surrounded by a rubber seal to keep out dust and moisture.
Found on the barrel of some Sigma lenses, the AFL button can be assigned to various functions to widen the range of operations available on the lens (available functions depend on the camera model).
This switch toggles between autofocus and manual focus.
The diaphragm is constructed of 11 rounded blades for a circular aperture opening and round out-of-focus highlights.
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