聚焦系统
| 最近聚焦距离 |
0.45 m |
| 光阑叶片数量 |
7 |
| 对角线视角（最大） |
69.3 ° |
| 最大光圈 |
22 |
| 组件应用 |
SLR |
| 焦距 |
18 - 250 mm |
18-250mm F3.5-6.3 DC (OS) Macro HSM
13.8x high zoom ratio lens designed exclusively for digital SLR cameras and incorporating Sigma’s original Optical Stabiliser function.
This high zoom ratio lens is designed exclusively for digital SLR cameras and incorporates Sigma’s original OS (Optical Stabiliser) technology. This system offers the use of shutter speeds approximately 4 stops slower. Pentax and Sony mount lenses are also equipped with the OS function as it is possible to use this with camera bodies which already incorporate a built-in anti-shake system. Four SLD (Special Low Dispersion) glass elements and three aspherical lenses provide excellent correction for all types of aberrations. High image quality is assured throughout the entire zoom range. The HSM (Hyper Sonic Motor) ensures fast and quiet auto-focusing. This lens has a minimum focusing distance of 45cm (17.7in) and a maximum magnification ratio of 1:3.4, making it convenient for close-up photography.
Sigma’s own unique OS technology
This lens is equipped with Sigma’s own unique OS technology. This system offers the use of shutter speeds approximately 4 stops slower. It also compensates for camera shake when shooting moving subjects such as motor sports. For Sony and Pentax mount, the OS function can be used even if the camera body is equipped with an anti-shake function. It is possible select either the lens’ OS system or the camera’s own anti-shake function.
Superior image quality
Four SLD (Special Low Dispersion) glass elements and three aspherical lenses provide excellent correction for all types of aberrations. High image quality is assured throughout the entire zoom range.
Reduced Ghosting and Flare
The super multi-layer coating reduces flare and ghosting and provides high contrast images even when the subject is backlit.
Minimum focusing distance of 45cm throughout the entire zoom range
A minimum focusing distance of 45cm (17.7”) throughout the entire zoom range and a maximum magnification ratio of 1:3.4 makes this lens ideal for close-up photography.
Quiet and fast AF
An inner focusing system and the incorporation of HSM provide fast and quiet auto-focusing.
*AF will not function if the Pentax camera bodies do not support HSM.
Petal-type hood
This lens is supplied with a Petal-type hood to block out extraneous light and reduce internal reflections.
Magnification scale
A magnification scale is displayed on the lens barrel, ensuring ease of use.
*Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.
