Bartech Remote Focus Device: Still the Best Bet
By: Chris Collins
We’ve all been waiting since NAB 2010 for Red Rock Micro to come out with their iphone wireless follow focus system. While I still can’t wait to buy one, I had to go another route when I landed a job with Sesame Street which required remote focus pulling. I haven’t had enough time to play with the Jag 35 wireless system and a Preston was out of our budget, so the Bartech single channel RFD was the obvious choice.
I went in to Birns and Sawyer a few days in advance to put together a camera package, and I did some tests. Unfortunately, the M-One motor is extremely strong. I was using an analog unit, so there was no way to adjust torque. While everything ran smoothly on wide lenses, I noticed unacceptable image shift when using a Zeiss ZE 85mm. It turns out that the Canon EF mount simply isn’t strong enough to handle the motor’s torque. Therefore, I decided to step it up to the Zeiss CP.2 lenses which all have a 1/4-20 thread for lens support. Better support=no image shift and a happy production.