Comparison of wireless follow focus systems: VariZoom, BarTech, Hocus Focus, and Preston

Gear

ZephyrCan I fly my Alexa or RED on a Zephyr?389

Master SeriesIs a used Master Series rig worth buying as a first big rig?191

BFDHow do I power my BFD receiver from my camera or sled?186

VoltCan I retrofit a Volt onto my existing sled or gimbal?168

ArtemisHow do I power my camera and accessories from an Artemis sled?166

MDRWhere can I mount my Preston MDR on my rig?143

ModulusIs there a Modulus option for HD wireless video?141

G-70Will my G-70 fit my vest, gimbal or sled?126

FI+ZCan I control iris and zoom wirelessly, not just focus?60

HU3Where can I get my HU3 repaired, refurbished or repainted?60

CineLiveHow do I pack and case my CineLive rig for transport?54

G-70XHow does the G-70X compare to Pro Titan, Xarm and other arms?46

Trinity 2Is Trinity 2 SUP 3.0 firmware safe to install or buggy?46

Ultra VestWhich vest should I choose for my body size, comfort and operator type?39

2010Follow Focus forum

16 years old. Gear and prices may have changed since.

The VariZoom system appears to be a rebranded version of the BFD follow focus system.
BarTech Digital Receiver can operate on voltages between 10 and 30 volts, with higher voltage enabling faster motor movement.
BarTech Digital Receiver is reported to control Preston motors faster than the Preston MDR2 receiver.
BarTech Digital Receiver operates on frequencies that avoid common 2.4GHz interference sources like WiFi, cellular phones, and Bluetooth devices, though some 900MHz wireless headsets may cause interference.
Two BarTech Digital Receiver systems cost approximately the same as one Preston single-channel system.
The BarTech Digital Receiver can work with Heden motors in addition to Preston motors.
Hocus Focus motor is capable of focusing RED prime lenses.
Hocus Focus was not FCC certified for use in the USA at the time of this discussion.

The comparison is from 2010 and product offerings may have changed.
No direct hands-on comparison between VariZoom and Hocus Focus was provided in the discussion.
Regulatory certification status for Hocus Focus in Canada was uncertain at the time.
Only certain sources of RF interference can affect BarTech Digital Receiver operation; the discussion does not provide a complete list of problematic interference sources.
The claim about BarTech controlling Preston motors faster than the MDR2 is based on limited field experience.