The SIGMA 18-250mm F3.5-6.3 DC OS HSM incorporates Sigma's original anti-shake
compensation function, with a 13.8 times zoom ratio. As opposed to having an
anti-shake function in the camera body, this lens's Hybrid Optical Stabilizer
provides not only an anti-shake function for the camera body, but also
compensates for image shaking in the view finder as the Optical Stabilizer is
built in to the lens.
Incorporating four Special Low Dispersion glass elements
and three aspherical lens elements provides excellent image quality throughout
the entire zoom range. This lens has a minimum focusing distance of 45cm (17.7
inches) at all focal lengths and a maximum magnification of 1: 3.4 reproduction
ratio, making it ideal for close-up photography.
An inner focusing system
eliminates front lens rotation, making it suitable for use with circular
polarizing filters and the supplied petal-type hood. Incorporating super
multi-layer coating reduce the ghost in the backlight photography.