Sigma 18-250mm F3.5-6.3 DC Macro OS HSM: Sigma SA Mount
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With the highly versatile, ultra compact Sigma 18-250mm zoom lens, high quality images are assured across the zoom range while the state of the art Hyper Sonic Motor ensures fast and quiet auto-focusing. Despite its small dimensions, the lens boasts a massive 13.8x zoom ratio as well as incorporating Sigma’s unique Optical Stabiliser (OS) technology to help counter camera shake at slower shutter speeds that can cause ruin crisp image quality. What’s more the system links to the anti-shake systems built into the Pentax and Sony camera bodies. With the magnification ratio of 1:2.9 and a minimum focusing distance of 35cm, this is a great choice of lens for close-ups. The Super Multi-Layer coating helps to reduce flare and there’s a magnification scale included on the lens barrel. As a lightweight, compact all-rounder, Photography Monthly picked out the Sigma 18-250mm as its super zoom winner saying that ‘it’s nicely screwed together, offers assured focusing, sound shake reduction and decent optical quality’.
Sigma’s 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.
Superior image quality
One SLD (Special Low Dispersion) glass element offers excellent correction of colour aberration and three aspherical lenses, including a double-sided aspherical lens, prevent and correct all types of aberrations such as astigmatism, achieving high image quality throughout the entire zoom range.
Reduced Ghosting and Flare
Sigma’s Super Multi-Layer Coating reduces flare and ghosting, ensuring sharp and high contrast images even in backlit conditions.
Minimum focusing distance of 35cm throughout the entire zoom range
A minimum focusing distance of 35cm throughout the entire zoom range and a maximum magnification ratio of 1:2.9 makes this lens ideal for close-up photography. When the APS-C size sensor is taken into consideration, the effective maximum reproduction ratio becomes 1:2.
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.
This lens is supplied with a Petal-type hood to block out extraneous light and reduce internal reflections.
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.
Focal length - wide (mm) 18
Focal length - tele (mm)250