18-50mm F2.8 EX DC AF HSM Lens for Nikon Digital SLRs
NOTE: This HSM (Hyper Sonic Motor) lens is available for Nikon Mount Only and is capable of autofocusing with all Nikon DSLR cameras.The Sigma Super Wide Angle Zoom 18-50mm 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. It is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size image sensor.
Lens Technology Explained:
ASP (Aspherical Lens)
The aspherical lens complex allows freedom of design, improved performance, a reduced number of component lenses and a compact size.
IF (Inner Focus)
To ensure stability in focusing, this lens moves the inner lens group or groups without changing the lens' physical length.
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 for Digital (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.
HSM (Hyper-Sonic Motor)
This lens uses a motor driven by ultrasonic waves to provide a quiet, highspeed AF.
Lens Construction: 15 Elements in 13 Groups
Angle of View: 76.5 - 31.7 degrees (SD format)
Number of Diaphragm Blades: 7 Blades
Minimum Aperture: F22
Minimum Focusing Distance 20cm/7.9 in.
Maximum Magnification: 1:3
Filter Size Diameter: 72mm
Dimensions: Diameter 79mm x 85.3mm / 3.1 in. X 3.4 in.
Weight: 535g/18.9 oz.