KENKO-Teleconverter-TELEPLUS-20X-for-HD-picture-Canon-EOS-EF-and-EFS-Lens
The HD DGX 2.0X converters have genuine Gate Array IC (Integrated Circuitry)- the converter's unique circuitry maintains signal integrity between the camera body and lens.
Full AF operation with the TELEPLUS HD DGX 2.0X is possible using a camera lens with an open aperture of F4 or brighter. AF will work properly only if there is enough light and contrast on the subject to activate the camera's AF sensors properly.
The converters have updated circuitry to record exif data more accurately. In the exif exposure data (meta-data recorded with a digital picture) the converters record the equivalent aperture and focal length of the lens setting plus teleconverter.