Super compact & lightweight, large aperture telephoto lens with life-size macro capability. Successor to the APO MACRO 150mm F2.8 EX DG HSM, introduced to market in October 2004, this new OS design offers the latest optical technology. A floating focusing system moves two different lens groups in the optical path to different positions. This system compensates for astigmatic aberration & spherical aberration & provides extremely high optical performance from infinity to 1:1 Macro. SLD glass & Super Multi Layer Coating Three SLD (Special Low Dispersion) glass elements provide excellent correction of all types of aberrations & the Super Multi-Layer Coating reduces flare & ghosting. This lens has superior peripheral brightness & provides sharp, high contrast images even at the maximum apertures. Optical Stabiliser Equipped with Sigmas proprietary OS (Optical Stabiliser) function, this lens offers the use of shutter speeds Approx. 4 stops slower than would otherwise be possible. F2.8 large aperture tele-macro lens Tele macro lenses have a greater working distance. It is possible to enjoy Macro photography, even when you are far from subject. This enables you to capture the small animals & insects without disturbing them. Very narrow depth-of-field allows selective focusing & less distracting backgrounds. Large aperture of F2.8 is ideal for sports, action & indoor photography. Hyper Sonic Motor (HSM) with full time manual focus override The HSM (Hyper Sonic Motor) ensures quiet & high speed autofocus as well as full-time manual focus capability. Floating Focusing System produces excellent optical performance A floating focusing system moves two different lens groups in the optical system to different positions. This system compensates for astigmatic aberration & spherical aberration. Since focusing does not change its overall length, this lens is easy to hold & use. Rounded 9 blade aperture ring This lens has a rounded 9 blade diaphragm creating a smooth blur to the out of focus areas of the image. It is also possible to use this lens with Sigmas optional APO Tele Converters. APO Tele-Converter EX (optional) It is also possible to use this lens with Sigma 1.4x EX & 2x EX APO Tele-Converter. When this lens is used with the 1.4x EX or 2x EX Apo Tele Converters (optional), it becomes a 210mm F4 AF tele-macro lens or a 300mm F5.6 MF tele-macro lens respectively. Specifications Lens Construction: 9 Elements in 13 Groups Angle of View: 16.4 degrees Number of Diaphragm Blades: 9 Blades Minimum Aperture: F22 Minimum Focusing Distance: 38cm Maximum Magnification: 1:1 Filter
Size: 72mm Dimensions: Diameter 79.6mm X Length 150mm Weight: 1, 150g