The Sigma 2x EX DG APO Tele Converter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300 mm lens will effectively increase the focal length to 600mm. A lens set to f/2.8 will now be f/5.6.The DG denotes an added coating that achieves the best color balance while cutting down on ghosting caused by reflections from the digital image sensor. The 2x EX is placed in the same way and it allows the photographer to use the 70-200mm f/2.8 lens as a 140-400mm f/5.6 telephoto zoom lens, and the 300mm f/2.8 lens as a 600mm f/5.6 ultra telephoto lens. First, attach the APO Tele Converter EX to the master lens. Then, attach the lens and the Tele Converter to the camera body. If you attach the Tele Converter to the camera body first it may cause a malfunction.If using a lens with a MINOLTA AF and attaching the APO Tele Converter EX to the camera body first, it may cause the AF mechanism to run idle.The 2x EX is placed in the same way and it allows the photographer to use the 70-200mm f/2.8 lens as a 140-400mm f/5.6 telephoto zoom lens, and the 300mm f/2.8 lens as a 600mm f/5.6 ultra telephoto lens. Important Notice: This teleconverter will not function correctly when used with the Sigma 70-200mm f/2.8 II APO EX DG MACRO for Pentax mount and Pentax D-SLR bodies. Usable Lenses and Combinations Sigma APO Tele Converter 1.4x and 2x are dedicated Tele Converter lenses, which should be used with listed lenses only. AF function of Pentax mounts cannot be used with SFX/SF7 cameras. Do not use the APO Tele Converter EX on top of another APO Tele Converter, or any other kinds of converters. To check compatibility on the Sigma Website, click here . Attaching the APO Tele Converter to the Lens First, attach the APO Tele Converter EX to the master lens. Then, attach the lens and the Tele Converter to the camera body.6 elements in 5 groups, Focus 2x that of a master lens, Aperture coupling range F2.8-F32, Dimensions: 6.9 X 5.2cm.
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