As a focus control mechanism employed in filmmaking or in TV production, the follow focus is

ergonomic rather than strictly necessary, that is, it does not contribute to the basic functionality

of a camera but allows the shoot results to be more efficient and precise. Generally, it is utilized

by a focus puller. However, some camera operators prefer to pull their own focus.

In current years, video capture capabilities came with the digital SLR camera are more and more rich

and powerful, which greatly reduces the cost and platform of filmmaking. As a result, a new wave of

low-cost filmmaking has became a new trend makes the film shooting with a digital SLR camera.

Follow focus plays an important role in the movie shooting. Film movie camera lenses are manual

focused, and due to the continuous changes of the screens according to the demands of plots, which

needs the focuses to be constantly varied. At that time a follow focus provides greater convenience

for the direct operation of the lens.