Adjustable fluid damping for smooth zoom movement. The variations
are due to optimal mechanical adjustment to the lenses for highest precision
of zoom drives. Some drives directly mount on the lens, others require a
support system (light-weight support with 15mm rod ∅). For use on bridge
plates with 15 or 19mm rods, the extensions EU15 and EU19 are available. A
short and a long zoom lever come with the basic unit.