Beginning with the ARRI/ZEISS LDS Ultra Primes in 2001 and Cooke's S4/i primes in 2004-2005, many cinema lenses have been able to transmit a lens’ focal length, serial number, current aperture, and the current focus distance via digital encoders wired to the focus and iris rings on their barrels. Many of these metadata-enabled lenses have also featured a multi-pin Lemo port to allow for this data stream to be sent directly to an on-camera monitor (such as the Starlite series of displays from Transvideo). The information would then be shown as an overlay, along with picture, to aid First ACs in focus-pulling and disseminating lens info throughout the set.