Sigma 28-45mm F/1.8 DG DN (A)
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.
Design and Performance
The lens features a total of 18 elements in 15 groups, with three aspherical and five Special Low Dispersion elements to minimize flare and ghosting and suppress various aberrations. This results in an optical performance that meets or exceeds that of other Sigma Art lenses, including the primes. Along with its 11-blade, rounded diaphragm, the design promotes sharpness and a large, smooth bokeh when used wide open. In addition to the f/1.8 maximum aperture, the lens also maintains an 30 cm minimum focusing distance across the entire zoom range. It achieves a maximum magnification ratio of 1:4 at its longest focal length, increasing depth of field and versatility in tight spaces.
Video Production
Designed with video creation in mind, the lens' bright f/1.8 aperture and wide-to-normal zoom range make it a versatile tool. An internal zoom design maintains the overall length during use, making it easy to balance on gimbals. The design also suppresses focus breathing for smooth movement across the focal range. Sigma's high-speed, high-response linear actuator autofocus remains both quiet and accurate, while manual focusing is improved with click and lock mechanisms.
Specs
- Maximum Aperture: f/1.8
- Minimum Aperture: f/16
- Lens Mount: Leica L
- Lens Format Coverage: Full-Frame
- Angle of View: 75.4° to 51.3°
- Minimum Focus Distance: 30 cm
- Optical Design: 18 Elements in 15 Groups
- Diaphragm Blades: 11, Rounded
- Focus Type: Autofocus
- Image Stabilization: No
- Filter Size: 82 mm
- Dimensions (ø x L): 87.8 x 153.4 mm
- Weight: 950 g
