The 2x DGII Teleconverter (7 element) for Nikon uses upgraded multi-coated optics to double the focal length of the existing lens. Using the 2x DGII teleconverter with an 85mm f/1.4 lens, for example, will double the focal length to 170mm, which effectively sets the maximum aperture at f/2.8 (cutting the amount of light captured). Also known as a tele-extender, it serves as an excellent lens modifier that is portable, high-quality and versatile. The lens used must have a maximum aperture greater than f/4.0 in order to fully utilize its autofocus capabilities.
Specification
Doubles focal length of digital Nikon SLR lens
Enhanced exposure at the converted focal length
7 element construction
Optimal when used with lenses of maximum aperture f/4.0 and greater
Compatible with all Sony digital SLR cameras
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