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24-70mm f/2.8 DG DN Art Overview
Positioned as a workhorse lens among Sony E-mount / Leica L-mount full-frame
mirrorless systems, the Sigma 24-70mm f/2.8 DG DN Art is a versatile wide-angle
to portrait-length zoom characterized by its f/2.8 constant maximum aperture.
The bright design suits working in available lighting conditions and also
affords increased control over depth of field. The optical design incorporates
a series of low dispersion and aspherical elements that greatly reduce a
variety of aberrations in order to achieve high sharpness, enhanced clarity,
and improved color accuracy. Both Super Multi-Layer and Nano Porous Coatings
have also been applied to improve contrast and color rendering by suppressing
lens flare and ghosting when working in strong lighting conditions.
Complementing the optical attributes, this lens also sports
a stepping AF motor, which yields fast, precise, and notably quiet autofocus
performance. At the wide end of the zoom range, a maximum magnification ratio
of 1:2.9 suits working with close-up subjects and an 11-blade diaphragm
contributes to a pleasing bokeh quality. Additionally, a weather-sealed design
benefits working in trying environmental conditions.
As part of the Art line within Sigma's Global Vision series,
this lens is designed to achieve truly notable optical performance and is
ideally suited for creative and artistic applications.
Standard zoom is designed for full-frame Sony E-mount / Leica L-mount mirrorless cameras, however can also be used with APS-C-format models where it
will provide a 36-105mm equivalent focal length range.
Constant f/2.8 maximum aperture is well-suited for working
in available light conditions and also provides greater control over depth of
field when using shallow depth of field techniques.
Six F Low Dispersion (FLD) and two Special Low Dispersion
(SLD) elements markedly reduce chromatic aberrations and color fringing
throughout the zoom range for improved clarity and color accuracy.
Three aspherical elements control spherical aberrations and
distortion for increased sharpness and accurate rendering.
Both Super Multi-Layer and Nano Porous Coatings have been
applied to lens elements in order to minimize lens flare and ghosting and
contribute to producing contrast-rich and color-neutral imagery, even in
Integrated stepping motor realizes quick and quiet
autofocus, which is further complemented by an optimized AF algorithm to
produce smoother focusing performance.
At the wide-angle end of the zoom range, a minimum focusing
distance of 7.1" is possible with a maximum magnification of 1:2.9 to suit
working with close-up subjects. At the telephoto end, the minimum focusing
distance is 1.25' with a maximum magnification of 1:4.5.
Integrated AF-L button can be programmed to adjust various
shooting settings and the lens also features a dedicated AF/MF switch and a
zoom lock switch to prevent the barrel from accidentally extended.
Rounded 11-blade diaphragm contributes to a pleasing bokeh
Brass bayonet affords improved mounting accuracy and
rigidity and rubber sealing is incorporated in the mount's design to render it
dust- and splash-resistant.