Product Description
The addition of the 18-250mm F3.5-6.3 DC Macro OS HSM speaks to Sigmas
versatile product lineup with this multipurpose zoom lens that offers Optical
Stabilization (OS) and covers wide angle to telephoto to macro photography. It
differs from Sigmas current 18-250mm F3.5-6.3 DC OS HSM lens with its even more
compact size, its macro capability with a maximum magnification ratio of 1:2.9
and the use of Thermally Stable Composite (TSC) material currently used only by
Sigma.
TSC, which is incorporated into the lens barrel and is often compared to
polycarbonate, has a high degree of elasticity and exhibits little variation in
its structure in extreme temperature conditions. This means that internal barrel
expansion and contraction due to extreme temperature variations is less
prevalent. TSC also contributes to the lens size reduction. The non-macro
18-250mm F3.5-6.3 without TSC weighs 22.2 ounces and is 3.1 by 4 inches in
diameter, whereas the new macro lens is 16.6 ounces and 2.9 by 3.5 inches in
diameter.
Sigma optimized this lens power arrangement by incorporating double-sided
aspherical lenses and reexamining the design to achieve a more compact filter
diameter. The lens has an approximate 13x high zoom ratio with a filter size of
62mm in diameter. Sigmas unique OS system, as well as one Special Low
Dispersion (SLD) glass and three aspherical lens glasses, compensate for camera
shake and enable correction of color aberration, respectively.
The new 18-250mm F3.5-6.3 DC Macro OS HSM lens is also equipped with Super
Multi-Layer Coating to reduce flare and ghosting, a Hyper Sonic Motor (HSM) to
ensure fast and quiet auto-focusing, and a rounded, seven-blade diaphragm to
create an attractive round blur to the out of focus areas. The lens features a
brass-made bayonet mount applied on the surface to reinforce strength for
long-term use and enable high accuracy and solidity.
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