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- E-Mount Lens/Full-Frame Format
- Aperture Range: f/2.8 to f/22
- Two FLD Elements, Two SLD Elements
- Three Aspherical Elements
- Super Multi-Layer & Nano Porous Coatings
- Water- and Oil-Repellent Front Coating
- Stepping Motor AF System
- Rounded 9-Blade Diaphragm
- Dust- and Splash-Proof Design
The 28-70mm f/2.8 DG DN Contemporary Lens for Sony E-Mount from Sigma is a versatile wide-angle to portrait-length zoom characterized by its f/2.8 constant maximum aperture.
The design suits working in available lighting conditions while affording increased control over depth of field.
More lightweight and compact than similar 24-70mm lenses, it's optical design incorporates two FLD and two SLD low-dispersion elements plus three aspherical elements that reduce a variety of aberrations to achieve high sharpness, enhanced clarity, and improved color accuracy.
It features just one lightweight focusing element, which keeps the AF unit small.
This, along with a quiet and fast stepping motor, makes for responsive and near-silent autofocus performance, an ideal combination for filmmakers looking for a high-performance, lightweight, and easy-to-handle camera system that works well with a gimbal or other accessories.
Each optical surface features Super Multi-Layer and Nano Porous coatings to improve contrast and color rendering by suppressing lens flare and ghosting for optimal light transmission, and an added water- and oil-repellent coating on the front optic helps keep the lens free from smudges and droplets.
The weather-sealed design benefits working in trying environmental conditions, and a nine-blade rounded diaphragm contributes a pleasing bokeh quality when using wider apertures.
- Standard zoom for full-frame E-mount mirrorless cameras
- 42-105mm equivalent focal length when used on an APS-C camera
- Constant f/2.8 maximum aperture for Low light use and depth-of-field control
- Two F Low Dispersion (FLD) and two Special Low Dispersion (SLD) elements reduce chromatic aberrations and color fringing
- Three aspherical elements control spherical aberrations and distortion
- Both Super Multi-Layer and Nano Porous coatings minimize lens flare and ghosting and produce contrast-rich and color-neutral imagery
- Integrated stepping motor and optimized AF algorithm provides quick and quiet autofocus
- 28mm minimum focus distance: 7.5", 1:3.3 magnification
- 70mm minimum focus distance: 15", 1:4.6 magnification
- Rounded nine-blade diaphragm for a pleasing bokeh quality
- Brass bayonet for mounting accuracy and rigidity
- Rubber sealing for dust- and splash-resistance
| Focal Length | 28–70 mm |
| Aperture | Max: f/2.8 Min: f/22 |
| Lens Mount | Sony E |
| Format Coverage | Full-Frame |
| Angle of View | 75.4° to 34.3° |
| Minimum Focus Distance | 19 cm / 7.5" |
| Magnification | 0.21x (1:4.6) |
| Optical Design | 16 Elements in 12 Groups |
| Aperture Blades | 9 (Rounded) |
| Focus Type | Autofocus |
| Image Stabilization | No |
| Filter Size | 67 mm |
| Dimensions | ø 72.2 × 101.5 mm ø 2.8" × L 4" |
| Weight | 470 g / 16.6 oz |