The HD DGX 2.0X converters have genuine Gate Array IC (Integrated Circuitry). This means the converter's unique circuitry maintains signal integrity between the camera body and lens. The 3~5-element design made with high quality multi-coated optical glass supplied by Hoya Corporation, the world's largest manufacturer of optical glass.Full AF operation with the TELEPLUS HD DGX 2.0X is possible usin...