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Sigma 28-70mm f/2.8-4 DG

Sigma 28-70mm f/2.8-4 DG lens
Sigma 28-70mm f/2.8-4 DG lens

Full frame sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.


No Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.


No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.


No Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.


Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.


Metal mount

Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important.


No Internal Focusing

Internally focusing lenses don't change their size while setting focus.


The front lens is rotating

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.


Not Sealed

Weather sealed lenses are protected from dust and water. While they are not water proof, these lenses can be used in rain and other humid environments. Some sealings only provide protection against dust or water, not both. Sealing is only available when the lens is used on a similarly weather sealed camera body.


No drop-in filter support

Drop-in filters are used in those lenses where either the front lens is too large, or the field of view doesn't permit the use of traditional filters at the front of the lens. Usually bright tele and ultra-wide angle lenses support this filter type.

This standard zoom lens is ideal for Digital SLR cameras, and has an F2.8 large aperture (at the 28 mm setting), and yet it is compact and lightweight, with an overall length of 62,5 mm and weight of 255 g. This lens comes into its own when active people need a lens that can keep up with them. The new multi layer coating of this lens cuts own flare and ghosting. A percfect solution for film and digitl SLR cameras. The minimum focusing distance is 50 cm throughout the entire zoom range. Aspherical lens elementt are used for excellent correction of distortion.

Sigma 28-70mm f/2.8-4 DG Specification

Available mount(s) Sigma
Application(s) Portrait, Landscape, Architecture
Category(s) Standard zoom
Stabilizer no
Focal length 28 - 70 mm (2.5× zoom)
Lens construction 11 elements in 8 groups
Angle of view 35mm: 75-4-34.3°
digital: 47.9-20.2°
Number of blades 8
Maximum aperture wide: f/2.8 tele: f/4
Minimum aperture wide: f/22 tele: N/A
Minimum focusing distance 50 cm
Magnification 0.15×
Filter size 58 mm
Size ∅ 67.5 × 62.5 mm
Weight 255 g
AF speed N/A
AF sound
Internal focusing no
Internal zoom N/A
Fix front lens no
Mount type metal
Weather sealed no
Drop in filter no
Ultrasonic AF no
Stepping motor AF no
APS-C sized circle no
Low dispersion lens element no
Hard case N/A
Soft case N/A
Lens hood LH630-01
printable lens hood
Tripod adapter N/A
Discontinued yes
Sigma 28-70mm f/2.8-4 DG Specification

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