Sigma 28mm F1.8 EX DG Aspherical

The Sigma 28mm F1.8 EX DG lens with a macro focusing capability and fast F1.8 maximum aperture is ideal for Digital SLR cameras. The Sigma 28mm  lens incorporates a Dual-Focus (DF) mechanism.

The Sigma 28mm F1.8 EX DG lens is capable of Macro photography, with minimum shooting distance of 20cm (7.8 inch) (reproduction ratio 1: 2.9) and angle of view is 75.4. With the Sigma 28mm you can take picture not only the subject but also the surrounding scenery.

The Sigma 28mm F1.8 EX DG Aspherical is a large aperture wide-angle lens for digital and 35mm film SLR cameras. The Sigma 28mm lens has a macro focusing capability with fast F1.8 maximum aperture, which is ideal for Digital SLR cameras. The Sigma 28mm lens has an advanced optical construction, in order to obtain adequate peripheral brightness with open aperture. Also, the iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. It is easy to hold the Sigma 28mm lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. Also, this also allows the use of a Petal-type Hood and the easy use of a polarizing filter.It incorporates a floating focus system and uses two aspherical lens elements for minimizing distortion, aberration and astigmatism.

Sigma 28mm F1.8 EX DG key features:

• Macro capability
  This Sigma 28mm  F1.8 EX DG lens is capable of Macro photography, with minimum shooting distance of 20cm (7.8 inch) (reproduction ratio 1 : 2.9) and angle of view is 75.4. You can take picture not only the subject but also the surrounding scenery.
• Large front element and Super wide-angle
  The Sigma 28mm  F1.8 EX DG lens has an advanced optical construction, in order to obtain adequate peripheral brightness with open aperture. Also, the iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background.
• Handling
  The Sigma 28mm F1.8 EX DG lens incorporates a Dual-Focus (DF) mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. Also, this also allows the use of a Petal-type Hood and the easy use of a polarizing filter.
• Aspherical lens
  The Sigma 28mm F1.8 EX DG lens incorporates a floating focus system and uses two aspherical lens elements for minimizing distortion, aberration and astigmatism. A new Sigma 28mm lens design claimed to maximize image quality at the closest focusing distances, plus compatibility with Sigma teleconverters, which can extend focal length out to a 465mm equivalent. Throw in the HSM motor—delivering fast, silent, and sure autofocus—and you’ve got quite a lens.
   

see the Sigma 28mm F1.8 EX DG and full range here