New Thermally Stable Composite material is used in the lens barrel
Ronkonkoma, NY, June 15, 2012 – Sigma Corporation of America, a
leading researcher, developer, manufacturer and service provider of some
of the world's most impressive lines of lenses, cameras and flashes, is
pleased to announce the availability of its new Sigma 18-250mm F3.5-6.3
DC Macro OS HSM lens starting in July 2012. Pricing is still pending.
The addition of the 18-250mm F3.5-6.3 DC Macro OS HSM speaks to Sigma's
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 Sigma's 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.
"We're constantly trying to improve and expand our lens lineup, and this
addition is no exception," said Mark Amir-Hamzeh, president of Sigma
Corporation of America. "By redesigning the lens and adding TSC, we are
able to offer this very compact, feature-rich lens that is flexible
enough to tackle a range of photography, including landscape, sport and
macro. This is key for the everyday photographer who wants to travel
light but pack the punch of a complete camera bag."
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 2.8 inches in diameter. Sigma's 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.