Sigma 28-45mm f/1.8 DG DN Art Lens (Leica L)

Product Introduction

The Sigma 28-45mm f/1.8 DG DN Art Lens is a professional wide-to-normal zoom lens designed for full-frame mirrorless cameras with a Leica L-Mount.

It combines a useful 28-45mm focal range with a constant f/1.8 aperture. Therefore, you get the flexibility of a zoom while keeping the light-gathering power of a fast prime lens.

Sigma designed this lens to deliver prime-like optical performance throughout the zoom range. Moreover, its bright aperture helps create a shallow depth of field and smooth background blur.

The lens also offers a video-friendly design. Its internal zoom keeps the overall lens length constant. As a result, it is easier to balance on a gimbal or use in a compact video setup.

Furthermore, fast autofocus, reduced focus breathing, and flexible manual focus controls make the lens suitable for both photography and video.

Design & Build Quality

Sigma 28-45mm f/1.8 DG DN Art Lens Design

The Sigma 28-45mm f/1.8 DG DN Art Lens uses a professional Art-series construction.

It features an 18-element, 15-group optical design. The lens also uses three aspherical elements and five Special Low Dispersion elements.

These elements help reduce optical aberrations and maintain high image quality across the zoom range.

Moreover, the internal zoom design keeps the overall lens length consistent while zooming.

Because of this, the lens maintains a more stable balance during handheld shooting and video work.

Dust- and Splash-Resistant Construction

The lens features a dust- and splash-resistant design.

Therefore, it is better suited to outdoor shooting and changing weather conditions.

In addition, the front element uses a water- and oil-repellent coating. This helps protect the front glass from moisture, fingerprints, and other everyday contaminants.

Durable Brass Bayonet Mount

Sigma uses a durable brass bayonet mount for the lens.

The mount provides a strong connection between the lens and compatible camera body.

As a result, it is suitable for regular professional use.

Practical Controls

The lens includes a Focus Mode Switch and two AFL buttons.

The AFL buttons can provide quick access to assigned camera functions on compatible bodies.

Furthermore, the lens includes a dedicated manual focus ring for precise control.

Performance

Constant f/1.8 Aperture

One of the biggest advantages of the Sigma 28-45mm f/1.8 DG DN Art Lens is its constant f/1.8 maximum aperture.

The aperture remains at f/1.8 across the complete 28-45mm zoom range.

Therefore, you can change focal lengths without losing the wide maximum aperture.

The bright aperture also helps when shooting in low light.

Moreover, it provides greater control over depth of field. This makes it useful for portraits, events, weddings, and creative video.

Prime-Like Optical Quality

Sigma designed this lens to offer optical performance similar to high-quality prime lenses.

The 18-element, 15-group design combines three aspherical elements with five Special Low Dispersion elements.

These elements help control distortion, chromatic aberration, and other optical issues.

As a result, the lens can produce detailed images with strong clarity across the frame.

Smooth Bokeh

The lens features an 11-blade rounded diaphragm.

This design helps create a smooth and natural-looking background blur.

Therefore, the lens works well for portraits, close-ups, weddings, fashion, and cinematic video.

Furthermore, the f/1.8 aperture helps separate the subject from the background.

Close-Focusing Performance

The lens offers a minimum focusing distance of approximately 11.9 inches across the entire zoom range.

It can achieve a maximum magnification ratio of 1:4 at 45mm.

Therefore, you can move closer to subjects without changing lenses.

This makes the lens useful for details, products, food, portraits, and creative close-up shots.

Features

Sigma 28-45mm f/1.8 DG DN Art Lens Zoom Range

The Sigma 28-45mm f/1.8 DG DN Art Lens covers a useful wide-to-normal focal range.

At 28mm, it works well for landscapes, interiors, travel, street photography, and environmental portraits.

At the middle of the range, it provides a natural perspective for everyday shooting.

At 45mm, it offers a tighter view that works well for portraits, details, and subject isolation.

Therefore, the lens can replace several common focal lengths in a compact professional setup.

Advanced Lens Coatings

Sigma uses Super Multi-Layer Coating and Nano Porous Coating on the lens.

These coatings help reduce flare and ghosting.

As a result, the lens can maintain better contrast when shooting in bright or challenging light.

In addition, the front element uses a water- and oil-repellent coating.

Internal Zoom Design

The internal zoom mechanism keeps the lens at a consistent overall length during zooming.

Therefore, the lens does not extend and retract as you change focal lengths.

This is particularly useful for video creators.

Moreover, the stable design makes the lens easier to balance on a gimbal.

Reduced Focus Breathing

The optical design helps suppress focus breathing.

Focus breathing can cause the frame to change slightly when the focus distance changes.

By reducing this effect, the lens provides smoother and more consistent framing during video recording.

Therefore, it is a useful feature for filmmakers, content creators, and run-and-gun shooters.

Linear and Non-Linear Focus Control

The L-Mount version supports switching between linear and non-linear focus ring settings.

The focus ring can offer a rotation angle from approximately 90° to 720°, depending on the selected setting.

As a result, video creators can choose a focus response that suits their shooting style.

Meanwhile, photographers can enjoy direct and intuitive manual focus control.

Fast Linear Actuator Autofocus

The lens uses a high-speed, high-response linear actuator autofocus system.

It provides fast and accurate focusing for both still photography and video.

Furthermore, the autofocus system operates quietly.

Therefore, it is suitable for situations where smooth and low-noise focusing is important.

Connectivity / Compatibility

Sigma 28-45mm f/1.8 DG DN Art Lens L-Mount Compatibility

The Sigma 28-45mm f/1.8 DG DN Art Lens in this configuration is designed for Leica L-Mount full-frame mirrorless cameras.

It is part of Sigma's DG DN lens range, which is designed specifically for mirrorless camera systems.

Therefore, it can be used with compatible L-Mount full-frame camera bodies.

Before purchasing, check your camera's mount compatibility to ensure the lens is suitable for your system.

Camera and Video Compatibility

The lens is designed for both photography and video workflows.

Its constant f/1.8 aperture provides consistent exposure control while zooming.

Moreover, internal zoom, reduced focus breathing, quiet autofocus, and flexible focus controls make it suitable for modern video production.

Battery / Power

No Separate Battery Required

The Sigma 28-45mm f/1.8 DG DN Art Lens does not require a separate battery.

The lens receives power directly from the compatible camera body.

Therefore, autofocus and electronic lens functions depend on the camera's battery and power system.

Because of this, there is no separate lens battery to charge or replace.

Usage

Professional Photography

The Sigma 28-45mm f/1.8 DG DN Art Lens is suitable for many professional photography applications.

It works well for:

• Portrait photography

• Wedding photography

• Event photography

• Travel photography

• Street photography

• Landscape photography

• Interior photography

• Fashion photography

• Product photography

• Documentary photography

Moreover, the constant f/1.8 aperture gives photographers more control in low-light conditions.

Portrait Photography

The 45mm focal length combined with the f/1.8 aperture can create attractive subject separation.

Furthermore, the 11-blade diaphragm helps produce smooth background blur.

Therefore, the lens can be a useful choice for portraits, lifestyle images, and fashion work.

Travel and Everyday Photography

The 28-45mm range covers several useful everyday focal lengths.

At 28mm, you can capture wider scenes.

Meanwhile, 45mm provides a tighter perspective for people and details.

As a result, the lens can reduce the need to change lenses during travel or everyday shoots.

Video and Filmmaking

The lens is designed with video production in mind.

Its constant f/1.8 aperture, internal zoom, quiet autofocus, and reduced focus breathing make it well suited to video work.

Moreover, the stable lens length helps with gimbal use.

Therefore, it works well for filmmakers, vloggers, commercial creators, and run-and-gun shooters.

Close-Up Shooting

The 11.9-inch minimum focusing distance provides added flexibility.

At 45mm, the lens reaches a 1:4 maximum magnification ratio.

Therefore, you can capture smaller subjects and details without using a dedicated macro lens.

Final Conclusion

The Sigma 28-45mm f/1.8 DG DN Art Lens combines the flexibility of a zoom with the bright aperture and optical performance of a fast prime lens.

Its constant f/1.8 aperture provides strong low-light performance and shallow depth of field throughout the zoom range.

Moreover, the 28-45mm focal range covers many useful shooting situations.

The advanced 18-element, 15-group optical design uses aspherical and Special Low Dispersion elements to maintain high image quality.

Furthermore, the 11-blade diaphragm creates smooth background blur, while the close-focusing capability adds extra versatility.

For video creators, the internal zoom, reduced focus breathing, quiet autofocus, and flexible focus ring settings provide practical benefits.

The lens also features dust- and splash-resistant construction, water- and oil-repellent front coating, two AFL buttons, and a durable brass bayonet mount.

Therefore, the Sigma 28-45mm f/1.8 DG DN Art Lens is a versatile professional zoom for photographers and filmmakers who want a bright, fast, and video-ready lens without sacrificing image quality.

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