Features and Functions: Description: Placed between the camera body and lens, a teleconverter contains a set of optics that will effectively increase the focal length of any lens with which it is used. The KENKO TELEPLUS HD DGX 2.0x Teleconverter has the effect of multiplying the focal length of your lens by 2.0x.The Kenko AF 2.0x Teleplus HD DGX Teleconverter for Canon EF-S & EF Lenses has genuine Gate Array IC (Integrated Circuitry). It means the converters unique circuitry maintains signal integrity between the camera body and lens. The 5-element design is made with high quality multi-coated optical glass supplied by Hoya Corporation, the worlds largest manufacturer of optical glass.The DGX TelePlus converters have updated circuitry to record exif data more accurately. In the exif exposure data (meta-data recorded with a digital picture) DGX converters record the equivalent aperture and focal length of the lens setting plus teleconverter. Optically and mechanically they are identical to the prior high-quality DG series converters.