Introduction:
1.A follow focus is a focus control mechanism used in film and video cameras. It is ergonomic rather than strictly necessary; in other words it does not contribute to the basic functionality of a camera but instead allows the operator to be more efficient and precise. It is usually operated by a focus puller but some camera operators prefer to pull their own focus.
2.DP500IIS follow focus is upgraded based on the previous DP500II version I follow focus.More elegent apperance,more practicable. Quick-release version,easily attach and detach.
3.The mechanism works through a set of gears on the follow focus that are attached to teeth on the focus ring of the lens. These gears feed to a wheel which, when turned by a focus puller, will spin the teeth and thus the ring on the lens. 

Specifications:
Material: Sturdy metal
Improved design has dampening which gives virtually zero backlash(<0.5mm).
Long-life precision engineered gearbox enables accurate and reliable focusing 
Compatible with industry standard Follow Focus Whip or Crank.
2 levels adjustable dammping.
Gear drive can be mounted from both side.(Works for both right-handed and left handed)
This set includes flexible gearbelt can be used with any zoom or prime lenses with a wide range of lens diamters(any size from 46 to 110mm)
Adjustable locking systems
Mounts onto 15 mm Rod Support (60mm center to center difference).
MOD Drive Gear: Industry standard 0.8.Can work with different size gear to meet you need with different lens.
Compatible with industry stand 15mm rods
Rail distance:60cm
Rail diameter: 15mm
Net weight:436g 
Suitable for: All DSLR cameras,Vedio cameras

Package Includes:

• 1 x Fotga DP5002S Follow Focus