Sigma's new 70-300mm f/4-5.6 DG OS lens for Sony and Pentax DSLRs
Sigma announced the new 70-300mm f/4-5.6 DG OS lens for Sony and Pentax DSLRs. The lens is designed to be an all-around useful telephoto zoom with its compact case and wide range. The new 70-300mm lens will be available next month.
The new lens’ defining feature is its optical stabilizer function, thus the “OS” suffix in the lens’ title. This function makes a difference of about four shutter speed stops, according to the Sept. 4 press release. The OS function can be used on cameras that have optical image stabilization built into the camera body; all Sony alpha DSLRs have image stabilization built into them, and some of the Pentax DSLRs do too. Despite this, Sigma recommends turning off the camera’s image stabilization system and leaving the OS function on the lens activated.
The stabilization feature on the Sigma 70-300mm f/4-5.6 DG OS lens is fully functional except when attached to film SLRs or the Pentax *ist series and K100D DSLRs; in these cases, the OS doesn’t work when used with the auto focus.
The lens measures 5 inches long and 3 inches in diameter, which makes it a great candidate for travel, nature, and sports photography, according to Sigma’s release. The compact telephoto zoom lens has a 9-blade aperture and can focus as close as 59.1 inches (1.5 meters).
Included in the 16 glass elements is a special low dispersion element that reduces chromatic aberration, and a super multi-layer coating on the other elements that reduces flare and ghosting.