If, by "motor to turn simultaneously with the pot" you mean that there is virtually instant correlation between the focus ring and the pot position I think that will be a challenge as higher power and speed will be needed, and probably a precision pot. Hocus Products, who makes the Axis 1 Wireless Follow Focus System, has been developing the device for several years, but they are now finally about to ship to users. If you want it to be fully automatic - so you can rely on it being in focus without looking at the viewfinder, that's a different matter - how will the Arduino know what the desired range is? But I suspect a servo should be adequate unless you want very high precision of the focus ring position. ![]() I'm sure some sort of servo setup would be adeqate. Hocus Focus featured an apprentice wizard who magically time traveled forward from the Middle Ages named Kryspen, who worked in the film department of a public library, who, along with his shape-shifting pet named 'Oulak', played short films. If you are doing it by eye then I don't see the need for much precision in the system as long as you can be sure it can turn the focus ring through it's full range. The development and initial psychometric investigation of the Hocus Focus Analytics (HFA) Scale, an instrument to measure student growth and outcomes using an arts-integrated teaching approach, is reported. Hocus Products Axis 1 Wireless Follow Focus System Wireless follow focus systems are slowly getting cheaper, but when you’re dealing with wireless, quality is still the most important aspect. ![]() I'm still not clear from your comments whether you determine "in-focus" manually (by eye - eyeally?) or whether you want the system to "know" that it must turn to (say) 175deg for a focus of 6ft. U.K.-based Hocus Products will launch the Axis1 at NAB a new wireless remote follow focus system for cine lenses. ![]() Commercial stuff could use any sort of motor because it's worth their while spending money on system design and software to save a few pennies in the cost of the hardware.
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