- Macro Lens With 1:1 Magnification - Focuses to 15" - Optical Image Stabilization - Hyper-Sonic Motor for Fast, Quiet AF - 3 SLD Elements Correct Aberrations - Splash-Proof Construction Protects Lens - For Canon SLR Cameras
The <Sigma 150mm f/2.8 EX DG OS HSM APO Macro Lens is a super compact and lightweight large aperture telephoto lens, with life-size (1:1) macro capability.
To maintain high optical performance from infinity to close-up 1:1 macro photos without accessories, this 150mm lens incorporates a "Floating Internal Focusing" (FIF) system. As a result, the lens also features a non-rotating front lens group which makes it easier to work with polarizing filters. The HSM feature provides ultra quiet high-speed autofocusing as well as full-time manual focus override. Optical image stabilization (OS) allows you to use shutter speeds 4 stops slower than would be possible without OS.
The improved DG lens design corrects for various aberrations, using 3 Special Low Dispersion (SLD) glass elements. This macro lens is specially coated to get the best color balance while cutting down on ghosting caused by reflections from the digital image sensor. The lens provides the utmost correction against lateral chromatic aberration which is a serious problem for digital SLR cameras. Splash-proof construction protects the lens from the elements.
Close focus capability of 15" (38 cm), with 1:1 magnification.
Three Special Low Dispersion (SLD) glass elements control various color aberrations and assure high image quality.
Offers Sigma's OS System (Optical Stabilization) allowing handheld photography even in low-light situations.
Hyper Sonic Motor HSM provides ultra quiet high-speed autofocusing as well as full-time manual focus override.
Splash-proof feature protects the lens from the effects of harsh weather conditions.
Designed for use with full frame digital SLR cameras. May also be used with smaller APS-c size sensors with a corresponding effective increase in focal length to about 225mm with most cameras.
This is the magnifying factor of a lens. Macro lenses will often be described by their “magnification factor”. A lens with a 1:1 magnification factor produces a projected image on the sensor which is the same as the subject.
The individual pieces of glass that form the overall optical construction. Most lenses have between four and eleven elements to bend the light rays to ensure a perfectly formed image appears on the light sensitive surface, such as a film or CCD. The elements are arranged in groups and may be seen in specification sheets as, for example, 6 elements in 4 groups. That configuration may have two single elements and the other four grouped in pairs.