Super Multi Coating reduces flare and ghosting that tends to occur when using digital SLR cameras.

Compact, lightweight, yet robust, large aperture zoom lens

This compact, large and constant F2.8 aperture zoom lens and is ideal for digital SLR cameras. Two SLD elements and four aspherical lenses provide the ultimate correction against distortion as well as all types of aberration, especially spherical aberration. Its advanced optical design ensures high performance throughout the entire zoom range.
The use of aspherical lenses in the construction of this lens not only corrects aberrations but also produces a very small and lightweight lens design. Its compact, yet robust, construction has an overall length of 87.2mm (3.4in.), maximum diameter of 74mm (2.9in.), filter size of diameter 67mm and weight of 510g(18.0 ounces).

Compact, lightweight Zoom Lens

The use of aspherical lenses in the construction of this lens not only corrects aberrations but also produces a very small and lightweight lens design. Its compact, yet robust, construction has an overall length of 87.2mm (3.4in.), maximum diameter of 74mm (2.9in.), filter size of diameter 67mm and weight of 510g(18.0 ounces).

F2.8 large aperture over the entire zoom range

This lens offers a large aperture of F2.8 over its entire range of focal lengths and its large depth of field offers greater freedom of creative expression.
This lens is perfectly suited for low light conditions indoors or at dusk. It covers wide angle to medium telephoto and is ideally suited to a wide range of subjects.

Excellent optical performance

Two Special Low Dispersion (SLD) glass elements are provided for effective compensation of color aberration, which is a common problem with super-wide angle lenses. Four pieces of hybrid aspherical lenses offer excellent correction for distortion as well as all types of aberration. This lens’ excellent optical performance makes it an ideal lens for Digital SLR Cameras as well as film SLR cameras.

Super Multi Layer Coating

It incorporates "Super Multi Layer Coating" to reduce the influence of harmful light caused by reflections from the digital image sensor.

Minimum focusing distance of 33cm (13 in.) at all focal lengths

It has a minimum focusing distance of 33cm (13 in.) at all focal lengths and a maximum magnification ratio of 1:4.4, which is very convenient for close-up photography.

Zoom Lock Switch Mechanism

This lens is also equipped with a zoom lock that eliminates "Zoom Creep". This remarkably compact, high performance zoom lens is ideally suited for traveling.

Petal Type Hood

Since the front of the lens does not rotate, a Petal-type hood and circular polarizing filters can be easily used.

Lens Construction	14 Elements in 12 Groups
Angle of View	75.4 - 34.3 degrees
Number of Diaphragm Blades	9 Blades
Minimum Aperture	F22
Minimum Focusing Distance	33cm /13 in.
Maximum Magnification	1:4.4
Filter Size	Diameter 67mm
Dimensions	Diameter 74mm X Length 87.2mm 2.9 in. X 3.4 in.
Weight	510g/18.1 oz.
Corresponding AF Mounts	SIGMA, CANON, NIKON (D), SONY/MINOLTA, PENTAX Nikon and Pentax mount lenses do not have an aperture ring.

لنز دوربین عکاسی سیگما 28-70mm F2.8 EX DG ASP

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