A floating focusing system moves two different lens groups in the optical path to different positions. A Special Low Dispersion (SLD) lens and one high refractive index SLD lens provide excellent correction for all types of aberration and distortion. Sigma’s own proprietary OS (Optical Stabilizer) system enables handheld close-up photography. This large aperture medium telephoto macro lens offers advanced performance of close-up photography. Is currently only available in complete camera systems Working distance at 1:1 (from end of lens to subject): 5.2" In order to attach Canon macro flashes, you also need the Macro Flash Adaapter 67 which screws into the end of the lens and adds the mounting "lip". NOTE: Unlike the non-L 100mm macro and the EF-S 60mm macro, this lens does not have macro flash mounting "lip" at the end of the lens. The lens was developed to expand users' photographing range and allow a wider range of users to easily enjoy macro photography. Hybrid IS effectively compensates for both angular and shift camera shake during close-up shooting. This is the first lens on the market to incorporate Canon's new Hybrid Image Stabilization Technology. With the highest quality optics available, combined with near-silent Ultrasonic focusing and life-size close-up capabilities without an adapter, the EF 100mm f/2.8L Macro IS USM is simply unrivalled. Canon's newest "L" series lens is its first mid-telephoto macro lens to include Canon's sophisticated Image Stabilization.
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