The Schneider 4.5 inch True Polarizing mounted glass filter is for cameras which use polarizing elements in the beam-splitters of the viewing system, such as ARRI 435 and the Movie-Cam Compact.
The Sound Devices HX3 is a portable stereo headphone amplifier for critical audio monitoring. This headphone amplifier is ideal for adding headphone feeds for portable and studio applications.
The Preston FI+Z Lens and Camera Control 2 channel system can control both lens functions (focus and iris) as well as camera functions (speed, shutter angle, and VTR).