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The best setup for fast lens swaps would be to use the fdff with the gear adapter, and to add lens gears to your other lenses. The nifty fifty adapter has a gear ring and grooves for a belt, so if your other two lenses have gear rings on them (we don't sell the lens gear itself but there are lots of affordable ones out there) you can change lenses easily. The Pro version of the fdff comes with the gear adapter. The fdff has been used on set by a number of our customers but it shines as a single operator focus for people who want really small setups as it's much smaller than a standard follow focus.
Looks like an awesome product Wiley, I have a nifty fifty, so I like the adaptor you guys made also. I have a 16-35 2.8L and a 70-200 2.8 L as well as the nifty fifty. What would be needed to transition easily between the lenses on a shoot?