50-200mm F4-5.6 DC OS HSM. Compact, High Performance Telephoto Zoom Lens...
This compact high-performance telephoto zoom lens incorporates Sigma's own Optical Stabilizer function. The lens incorporates SLD (Special Low Dispersion) glass in the front lens groups and is equipped with an inner focusing system to provide high image quality throughout the entire zoom range.
The incorporation of HSM (Hyper-Sonic Motor) ensures quiet and high-speed auto focus. The OS (Optical Stabilizer) function effectively eliminates the effects of camera shakeso subjects can be easily and clearly seen in the viewfinder as well as in the image. It allows the use of shutter speeds up to 4 stops slower than normal for steady, handheld photography.
For Sony and Pentax mounts the built-in OS System allows the photographer to see the stabilized image in the viewfinder and can be used as an alternative with cameras having built-in image stabilization. The Super Multi-Layer Coating reduces flare and ghosting and provides high contrast images throughout the entire zoom range.
This lens has a minimum focusing distance of 43.3inches (110cm) throughout the entire zoom range and a maximum magnification ratio of 1:4.5. An inner focusing system eliminates front lens rotation, making it suitable for use with circular polarizing filters.
Construction 14 Elements in 10 Groups Angle of view 27.9 - 7.1 degrees F stop range f/22 Closest Focusing Distance 110 cm / 43.3 inches Maximum Magnification 1:4.5 Filter Size 55mm Dimensions (Length x Diameter) Diameter 74mm X Length 101.9mm
2.9 in. X 4.0 in.
Weight n/a Notes Number of Diaphragm Blades: 8 Pcs.
* Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.
* For Pentax mount, if the camera body does not support HSM, auto focus will not be available.