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Sigma 17-50mm F2.8 EX DC OS HSM for Pentax

Optical Characteristics

With a 35mm equivalent focal length range of 25-80 mm, this lens offers a Standard Wide Zoom perspective.

Recommended Applications

* Recommendations are based only on the features necessary to perform the application successfully and do not take into account the relative image quality of different lenses

General Use

A basic kit for non-specific photography should cover between 28-300mm

Landscapes

Wide expanses and panoramas can be captured on the wide end of this focal length. For this application aperture settings will usually vary from f5.6 and smaller and cameras will usually be tripod mounted.

Interiors

Wide angle lenses are a must to capture the look of a room when working in confined spaces. This lens’s fast aperture allows you to capture as much natural light as possible and the camera will usually be tripod mounted to use slower shutter speeds.

Technologies

ASP (Aspherical Lens)

The aspherical lens complex allows freedom of design, improved performance, a reduced number of component lenses and a compact size.

OS (Optical Stabilizer) Function

This function utilizes a built-in mechanism that compensates for camera shake. It dramatically expands photographic possibilities by alleviating camera movement when shooting by hand held camera.

HSM (Hyper-Sonic Motor)

This lens uses a motor driven by ultrasonic waves to provide a quiet, highspeed AF.

EX (EX Lens)

The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance.

DC (DC Lens)

These are special lenses designed so that the image circle matches the smaller size of the image sensor of most digital SLR cameras. Their specialized design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is an added bonus ! including compact and lightweight construction.

Specifications

35mm equivalent focal length range: 25-80mm
Lens perspective: Standard Wide Zoom
Minimum aperture: f22
Image stabilisation: In-camera stabilisation
Hyper-Sonic Motor YES
Special lens elements: 17 Elements in 13 Groups
Filter size: 77mm
Dimensions: 83.5 x 91.8 mm
Maximum magnification: 1:5
Recommended applications: General use, Landscapes, Interiors

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