PRESS RELEASE - Sigma Imaging UK

June 2012
18-250mm f3.5-6.3 DC Macro OS HSM
Compact, Optically Stabilised superzoom lens for digital cameras
SLD and Aspherical lens elements
Incorporates newly developed Thermally Stable Composite
Equipped with HSM ensuring quiet and high speed AF
Incorporates Sigma’s unique Optical Stabilisation system*
Compact and lightweight construction
The Sigma Corporation is pleased to announce the announce the new Sigma 18-250mm F3.5-6.3 DC
MACRO OS HSM, a compact, high zoom ratio lens, covering wide angle, telephoto and macro
By revolutionising the optical and structural design of the Sigma 18-250mm F3.5-6.3 DC OS HSM, this
new lens achieves a compact size and a minimum focusing distance of 35cm. Sigma’s newly developed
material, Thermally Stable Composite (TSC), which maintains its size and structure in varying
temperatures, is incorporated into the lens barrel.
Designed exclusively for digital SLR cameras, this versatile lens covers wide-angle to telephoto making it
suitable for many types of photography. Its small size and huge focal-range make it perfect for travel
photographers and those who like to keep equipment down to a minimum.
This is the first lens to use Thermally Stable Composite (TSC). This is a unique product that’s been
developed in conjunction with a specialist manufacturer. This material is unique to Sigma and has metal
like characteristics. Traditionally, Sigma use engineering plastic which is polycarbonate mixed with 2030% glass. The advantages of this are its high resistance to impact, it’s lightweight and it doesn’t degrade
over time. However, the drawbacks are its plastic feel and high dependency on temperature. In differing
temperatures it expands and contracts considerably. As a result, a large gap is required between any
metal/composite interface to allow for this expansion/contraction in size. The new TSC material has
overcome this and is much more stable in varying temperatures. Consequently, a tighter construction can
be achieved with thinner and lighter material.
Sigma’s own unique Optical Stabiliser (OS) function is incorporated into this lens. It offers effective
correction of approximately 4 stops, overcoming camera shake even in close-up range photography.
※Sony and Pentax mounts are not incorporated with OS function.
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.
Sigma’s Super Multi-Layer Coating reduces flare and ghosting, ensuring sharp and high contrast images
even in backlit conditions. The supplied petal-type hood can be attached to block out extraneous light
which has a harmful influence on image rendering.
The close-up capability is improved with a minimum focusing distance of just 35cm throughout the entire
zoom range and maximum magnification ratio of 1:2.9. When the APS-C size sensor is taken into
consideration, the effective maximum reproduction ratio becomes 1:2.
The lens benefits from a Hyper Sonic Motor (HSM) to ensures fast and quiet auto-focusing.
This lens incorporates a brass made bayonet mount which has both high accuracy and solidity, the same
as the mount of camera bodies. A special treatment to reinforce the strength is applied to the surface to
ensure resistance to wear through long-term use.
*Sony and Pentax mounts do not incorporate Optical Stabilisation.
Minimum Aperture
Lens Construction
Angle of View
No. of Diaphragm Blades
Available Fittings
Minimum Focusing Distance
16 Elements in 13 Groups
Maximum Magnification
76.5°- 6.5°
Filter Size
7 pcs (Rounded)
Lens Hood
Diameter 73.5mm x Length 88.6mm
Sigma AF, Nikon AF, Canon AF, Pentax AF, Sony AF
For further information please contact:
Sigma Imaging (UK) Ltd, 13 Little Mundells, Welwyn Garden City Hertfordshire, AL7 1EW
Tel 01707 329999 E-Mail [email protected], Website