The world''s first F1.8 full-frame zoom
The SIGMA 28-45mm F1.8 DG DN | Art is a groundbreaking optic—the first full-frame zoom to feature a constant F1.8 aperture. Delivering clarity and sharpness on par with prime lenses, it offers photographers and filmmakers a unique blend of flexibility, speed and uncompromising image quality.
Building on SIGMA''s pioneering heritage of large-aperture zooms, including the acclaimed 18-35mm F1.8 DC HSM | Art and 24-35mm F2 DG HSM | Art, this innovative lens brings a new level of creative freedom to full-frame mirrorless systems. With its unmatched brightness, advanced optics, fast and precise AF, and a robust professional feature set, the 28-45mm F1.8 opens up new possibilities for stills and video alike.
Whether shooting wide open in low light, isolating a subject with beautifully smooth bokeh, or enjoying the convenience of a zoom without sacrificing quality, this lens redefines what''s possible.
Constant F1.8 aperture
At the heart of the 28-45mm is its unprecedented F1.8 aperture, maintained throughout the entire zoom range. This allows full-frame users to work handheld in low-light conditions, capture scenes with remarkable depth-of-field control, and enjoy a level of background separation rarely available in a zoom lens. From expansive environmental portraits to cinematic video sequences, the 28-45mm F1.8 ensures expressive power in every frame.
Exceptional build quality
Despite its ultra-fast aperture, the lens weighs less than 1kg, combining strength and portability in equal measure. Its robust design features weather sealing throughout, a durable brass mount with a protective rubber seal, and a f82mm filter thread for convenience.
Controls include a de-clickable aperture ring for stepless adjustments, a lock switch to prevent accidental changes, and a precision-engineered petal-type hood with lock button and rubberised grip. This balance of rugged reliability and refined handling ensures the lens is ready for any professional environment.
Professional feature set
The 28-45mm F1.8 is equipped with a wide range of features designed for demanding photographers and filmmakers:
AF/MF switch for quick operation
Two customisable AFL buttons for ergonomic control in any orientation
Aperture ring with de-click and lock functions
Dust- and splash-resistant structure with weather sealing around rings, buttons and switches
Water- and oil-repellent front coating for easier cleaning in adverse conditions
The barrel is constructed from Thermally Stable Composite (TSC) alongside aluminium components, ensuring consistent performance across temperature changes.
Fast, precise autofocus
Powered by SIGMA''s HLA (High-response Linear Actuator), the 28-45mm achieves autofocus that is fast, accurate and virtually silent. Capable of moving larger focusing groups than conventional motors, the HLA unlocks advanced optical designs while ensuring pin-sharp results and excellent subject tracking. This makes the lens as responsive for stills as it is for smooth, noise-free video work.
Prime-like optical quality
Engineered with 5 SLD and 3 aspherical elements, the lens rigorously suppresses optical aberrations to deliver results that rival prime lenses. Axial chromatic aberration—a common challenge in large-aperture designs—is thoroughly corrected, while SIGMA''s advanced coatings minimise flare and ghosting even in strong backlight.
Across the zoom range, images are crisp, detailed and richly defined, with natural colour rendition and beautifully smooth bokeh. Focus breathing is also minimised, ensuring consistent framing during focus pulls—a key advantage for filmmakers.
Close-up capability
The lens maintains a minimum focusing distance of 30cm throughout the zoom range, with a maximum magnification ratio of 1:4 at the telephoto end. This allows photographers to capture detailed close-ups while retaining flexibility to reframe using the zoom—ideal for confined spaces or creative compositions.
Rugged design, stable handling
With internal zoom and internal focusing, the 28-45mm F1.8 maintains its overall length during operation, improving balance for handheld shooting and ensuring stability when mounted on a gimbal or tripod. This design also enhances resistance to dust and moisture ingress, further improving reliability in demanding conditions.
28-45mm LENS
LENS HOOD LH878-06
FRONT CAP LCF-82 III
REAR CAP LCR II
