聚焦系统
| 最近聚焦距离 |
0.5 m |
| 光阑叶片数量 |
8 |
| 对角线视角（最大） |
75.4 ° |
| 最大光圈 |
22 |
28-70mm F2.8-4 DG Sigma AF
Compact, large aperture zoom lens is ideal for 35mm digital SLR cameras.
This standard zoom lens has a large aperture of F2.8 at 28mm focal length and yet it is compact and lightweight, with an overall length of 62.5mm (2.5») and weight of 255g. (9oz.). This digitally optimized diagonal fisheye lens is equipped with a new multi-layer coating technology that reduces both flare and ghosting. This compact, large aperture zoom lens is ideal for digital and 35mm SLR cameras.
New coating reduces Ghost and Flare.
The new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance.
Compact and lightweight lens design.
This standard zoom lens has a large aperture of F2.8 at 28mm focal length and yet it is compact and lightweight, with an overall length of 62.5mm (2.5») and weight of 255g. (9oz.). Ideally suited for traveling, landscape photography and general photography. The supplied zoom hood can be used to obtain a superior light-blocking effect.
Minimum focusing distance of 50cm (19.7 inches) throughout the entire zoom range.
From 28mm wide to 105mm tele range this zoom lens has 50cm (19.7inches) minimum focusing distance. It has also maximum magnification of 1:6.5.
Aspherical Lens.
An aspherical lens element is used for excellent correction of distortion.
Zoom Hood.
A zoom hood is supplied with this lens for complete depth in the telephoto range and glare-free shooting in the wide-angle range.
