The Sunpak CA-1AF Dedicated Module will allow Sunpak flashes that make use of modules to attach to Canon EOS SLR cameras, and to support the advanced flash features provided by the flash and/or camera.
This module supports TTL, auto-zoom, AF-assist, 2nd curtain sync operation, as well as other functions (where supported by the camera and flash).
Note:
Does not support TTL operation with digital cameras.