ART

28–45mm F1.8 DG DN

ART

28–45mm F1.8 DG DN

Available Mounts

L-Mount
Sony E-Mount

The world’s first full-frame, F1.8 maximum aperture zoom lens
Excellent optical performance comparable to that of a prime lens
High-speed AF speed and innovative features

The world’s first* F1.8 full-frame mirrorless zoom

The 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.

^{* As of June 2024 by Sigma}

Camera Type	Mirroless
Corresponding Mount	L-Mount, Sony E-Mount
Sensor Format	Full-frame [DG]
Lens Construction	18 elements in 15 groups (5 SLD, 3 aspherical elements)
Angle of View	75.4-51.3°
Number of Diaphragm Blades	11 (rounded diaphragm)
Minimum Aperture	F16
Minimum Focusing Distance	30cm / 11.9in.
Maximum Magnification Ratio	1:4 at f=45mm
Filter Size	φ82mm
Dimensions (Diameter × Length)	L-Mount：φ87.8mm x 151.4mm / φ3.5in. x 6.0in. Sony E-mount：φ87.8mm x 153.4mm / φ3.5in. x 6.0in.
Weight	L-Mount：960g / 33.9oz. Sony E-mount：950g / 33.5oz.
Edition Number	A024 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	CASE LENS HOOD LH878-06 FRONT CAP LCF-82 III REAR CAP LCR II
Mount / Product Barcode	L-Mount：00-85126-61269-6 Sony E-mount：00-85126-61265-8
Camera Compatibility	LINK
	* L-Mount is a registered trademark of Leica Camera AG. * This product is developed, manufactured and sold based on the specifications of E-mount which was disclosed by Sony Corporation under the license agreement with Sony Corporation.

The world’s first* full-frame, F1.8 maximum aperture zoom lens

Sigma has successfully developed the world’s first full-frame zoom lens with a maximum aperture of F1.8. The Sigma 28-45mm F1.8 DG DN | Art incorporates an inner zoom mechanism, a minimum focusing distance of 30cm across the entire zoom range, and a filter size of φ82mm. Despite its advanced feature-set, the lens weighs less than 1kg, making it a portable and versatile option for either hand-held shooting or a gimbal setup.

* As of June 2024 by Sigma

Constant maximum aperture of F1.8

Once a privilege reserved only for prime lenses, the maximum 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.

Practical and stable inner zoom

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.

Consistent close focus

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.

Premium build at a lighter weight

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.

Excellent optical performance comparable to that of a prime lens

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

The pinnacle of optical quality in a zoom

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.

LENS CONSTRUCTION

MTF Chart

DIFFRACTION 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

Aperture ring, designed to help users work intuitively

Aperture ring click switch

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.

Aperture ring lock switch

A ring lock system to prevent from unintended movement of the aperture ring during shooting.

AFL button

the AFL button can be assigned with various functions widens the range of operations available on the lens.

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.

Dust and Splash Resistant Structure

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.

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.

Compatible with high-speed autofocus

Supports DMF and AF+MF

Compatible with AF assist (for Sony E-mount only)

Petal-type hood with lock LH875-05

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

High-precision, durable brass bayonet mount

Mount Conversion Service available

“Made in Aizu, Japan” craftsmanship