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Lens Construction:16 Elements in 11 GroupsAngle of View:23.3 degreesNumber of Diaphragm Blades:9Minimum Aperture:f22Minimum Focusing Distance:31.2 cm / 12.3 inFilter Size:Diameter 62mmMaximum Magnifications:1:1Compatibility:Canon EOS DSLR CamerasDimensions (Diameter x Length):126.4mm x 78.3mm / 5.0 in. x 3.1 in.Weight:725g / 25.6oz.・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 150mm with most cameras・Focuses down to 1:1 magnification ratio at its closest working distance of 12.3 inches・Extremely compact measuring only 5.1 inches long・A hood adapter lens hood front & rear lens caps are included with the lensThe Sigma 105mm f/2.8 EX DG OS HSM Macro Lens for Canon EOS DSLR Cameras offers advanced performance of close-up photography. The OS (Optical Stabilizer) system enables handheld close-up photography. A Special Low Dispersion (SLD) lens and one high refractive index SLD lens provide excellent correction for all types of aberration and distortion. A floating focusing system moves two different lens groups in the optical path to different positions. This system compensates for astigmatic aberration and spherical aberration and provides extremely high optical performance from infinity to 1:1 Macro.The Super Multi-Layer Coating reduces flare and ghosting providing high contrast images. It is also possible to use this lens with Sigma's APO TELE CONVERTERS. The HSM (Hyper Sonic Motor) ensures quiet and high speed autofocus as well as full-time manual focus capability. This lens features a splash proof design for use in harsh conditions and a rounded 9 blade diaphragm creating an attractive blur to the out of focus areas of the image.

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