To achieve an F2.8 aperture at all focal lengths, it employs three aspherical Lens to provide optimum aberration compensation. Two Special Low Dispersion (SLD) glass elements are provided for color aberration compensation, to assure high image quality.

Optimized for digital SLR cameras

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

Excellent correction of aberrations

Two SLD elements, one Glass Mold Aspherical plus two Hybrid Aspherical lenses provide excellent correction of various aberrations and a high level of optical performance.

Minimum focusing distance of 40cm (15.7 inches)

The lens has a minimum focusing distance of 40cm (15.7 inches) at all focal lengths and is capable of macro photography with a maximum magnification ratio of 1:3.8.

DF (Dual Focus) System

This lens incorporates a Dual Focus (DF) system that is designed to make the lens easy to hold during autofocusing, and yet provides a large focus ring for easy manual focusing.

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	13 Elements in 14 Groups
Angle of View	84.1 -34.3 degrees
Number of Diaphragm Blades	9 Blades
Minimum Aperture	F32
Minimum Focusing Distance	40cm / 15.7 in.
Maximum Magnification	1:3.8
Filter Size	82mm
Dimensions	Diameter 88.7mm X Length 115.5mm 3.5 in. x 4.5 in.
Weight	715g / 25.2oz.
Corresponding AF Mounts	SIGMA, CANON, NIKON (D), SONY/MINOLTA (D), PENTAX

لنز دوربین عکاسی سیگما 24-70mm F2.8 EX DG MACRO ASP/ HSM

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