Most of this new Sigma travel lens is in its name. The Sigma 18-250mm F3.5-5.6 DC Macro OS HSM :
- offers a 13x zoom range
- is for APS-C DSLRs
- will give an equivalent to a 27-375mm lens on a Nikon, Pentax, Sigma and Sony APS-C Digital SLR
- will give an equivalent to a 29-400mm on a Canon APS-C DSLR (crop ratio of 1.6x) like the EOS 650D / Rebel T4i
- is optically stabilized (Sigma OS system)
- is gifted for macro photography with a closest focusing distance of only 32cm / 12.6″ at all focal length which leads to a maximum magnifying ratio of 1:2.9 which, with the 1.5x APS-C crop ratio offers a 1:2. That means that 2mm of real life will represent 1mm on the sensor.
- it has an ultrasonic autofocus engine, Sigma’s SWM AF drive
- It has a maximum aperture range of f/3.5-6.3 which is not as fast as the AF-S Nikkor 18-300mm f3.5-5.6G ED VR announced yesterday by Nikon, a slightly faster lens in telephoto, but almost twice the Sigma lens price and weight…
But that is not it. The Sigma 18-250mm F3.5-5.6 DC Macro OS HSM is also quite compact and lightweight compared to its previous non macro version. It now weights a mere 470 grs / 16.6 ounces and it uses 62mm filters. Its optical build gets 1 SLD lens and 3 aspherical lenses (double sided aspherical elements). The lens receive a Super Multi Layer Coating to prevent fare and ghost images. It has 7 circular diaphragm blades and the lens barrel is made of a new composite material called “TSC” for “Thermally Stable Composite”, a new kind of stuff that is not temperature sensitive. Therefore, it will not expanse under high temperatures. It has also 25% more flexibility than the regular plastics (sorry, polycarbonates should I say) amateur lenses are usually made of. Sigma claims TSC technology will bring a major improvement in the lens durability, the brand’s major weakness.
The Sigma 18-250mm F3.5-5.6 DC Macro OS HSM will be available for Canon, Nikon, Pentax, Sigma and Sony SLRs. It is sold €599 in Europe. US price TBC.