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The Sigma 28-70mm f/2.8 EX DG Lens for Nikon F is a compact, lightweight, yet robust standard zoom lens built for Nikon F-mount digital SLR cameras while remaining fully usable on 35mm film SLRs. Covering a wide-angle through short telephoto focal range with a constant f/2.8 maximum aperture, it’s well suited to photojournalism and general-purpose photography, particularly in indoor or dusk lighting conditions.
Optically, the lens is built from 14 elements in 12 groups, including two Special Low Dispersion (SLD) glass elements and four aspherical lens elements, delivering effective correction against distortion and all types of aberration, especially spherical aberration, while keeping the lens notably small and lightweight for a constant-aperture zoom. Sigma’s Super Multi Layer (SML) coating reduces ghosting and flare for improved color performance, and a 9-blade diaphragm contributes to the lens’s background rendering, with an aperture range of f/2.8 to f/22.
As a D-type Nikon lens, it transmits distance information to compatible camera bodies, and the lens does not include a traditional aperture ring, similar to Nikon’s own “G” type lenses, limiting full compatibility to camera bodies that support aperture control entirely through the body (older cameras may be restricted to Programmed or Shutter-Priority auto exposure modes only, and the D40 and D60 do not support autofocus with this lens). Autofocus is driven by the camera body’s screw-drive mechanism, and the lens’s Internal Focusing (IF) design keeps the focus ring from rotating or extending the front element during autofocus, making handheld use and the application of circular polarizing filters more convenient.
A standout feature is the lens’s close-focusing capability, with a minimum focusing distance of 13 in. (33cm) maintained at all focal lengths, yielding a maximum magnification ratio of 1:4.4. Build quality is solidly constructed, with a 67mm filter thread, and the lens extends approximately 1 in. (23-26mm) at the front when zoomed to 70mm via a broad zoom ring that includes a lock at the 28mm position, with markings at 28, 35, 40, 50, and 70mm. The lens measures approximately 2.9 x 3.4 in. (74 x 87.2mm) and weighs approximately 18.0-18.1 oz. (510g), and does not include image stabilization.
As part of Sigma’s DG lens line, the 28-70mm f/2.8 EX DG is optimized for digital SLR cameras while remaining fully compatible with 35mm film cameras, delivering its full wide-to-telephoto angle of view on full-frame Nikon bodies and an effective, narrower equivalent field of view on APS-C (DX) Nikon cameras.
Key Features
– 28-70mm constant f/2.8 standard zoom for Nikon F mount
– 14 elements in 12 groups, including 2 SLD elements and 4 aspherical elements
– Super Multi Layer (SML) coating
– 9-blade diaphragm; aperture range f/2.8 to f/22
– D-type lens (transmits distance information); no aperture ring (G-type style)
– Screw-drive autofocus (camera body motor); not supported on D40/D60
– Internal Focusing (IF) — non-rotating front element
– Minimum focusing distance of 13 in. (33cm) at all focal lengths
– Maximum magnification ratio of 1:4.4
– Zoom lock at 28mm position
– 67mm filter thread
– No image stabilization
– Approximate weight: 510g (18.0-18.1 oz.)
– Compatible with full-frame and APS-C (DX) Nikon F-mount digital and film SLR cameras
