So up pops on eBay a 2.4G Wireless follow focus / lens server for DSLR lenses for $315.
Looks like it comes from a Chinese Mob called PowerKam who have been making motorised pan tilt heads for a while.
Synchronous control for servo by potentiometer
270 degree control for gear
M0.8 gear with gear ring for max 110mm lens
wireless system with sender and receiver
0.8M 64MM diameter gear
rechargable battery inside for about 2 hours
for 15mm rail system
distance of about 500 meter in open space without barriers
1. controller&sender 1x
2. servo with bracket 1x
3. gear belt 1x
4. 2 meter control cable 1x
5. battery recharger 1x
6. receiver unit 1x
They do add… “Please be noted it is a little noisy when servo is working, so make sure it is no problem for you.”
Grab a 2.4G Wireless follow focus / lens server for DSLR lenses for $315 and free shipping.