The FMM-6B Manual Focus Module for Select Fujinon ENG/EFP Lenses from Fujinon is a manual focus block designed for use with select Fujinon HDTV ENG/EFP lenses. This module is not compatible with Fujinon HA25, HA36x, HA42 Lenses, which require a different module. The module connects to a cable and grip, not included, and it is designed to give you precision manual focus control.