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This is a 35mm 1.8 on a slider c100 pulling focus;
https://www.dropbox.com/s/k7h8wkf0zf82dab/Sequence 1.mov
Another example where the AF is very useful:
https://www.dropbox.com/s/6q2loommql7shch/ptc.mov
try pulling that focus without a cinevised Lens and Focus Puller
I've had an ongoing assignment that involves shooting jewellery being made, with reportage of discussions with the designer and the jewellers 'as it happens'. Nothing staged, all 'fly on the wall' stuff - although it's more like 'fly buzzing around' as I need to cover the angles.
Basically, the assignment would have been VERY difficult without DPAF. Main lenses were the 100mm 2.8 Macro IS, and the 18-135 STM. Due to the speed at which I have to work, and the confined spaces I'm working in, no tripod, not even a monopod as I'm having to change height to shoot around heads and under elbows and all sorts of contortions. DPAF, and the ability to switch it on and off, leaves one less thing to worry about - especially with the 18-135.
It is especially useful for the sort of person who buys a C100 - event videography and non-broadcast docco. If your milieu is shooting with Cine Primes with an assistant and/or focus puller, it's of no interest. If, however, you're required to get a lot of coverage very fast, you're working with the STM lenses and the 'Run & Gun' style of coverage, the DPAF is 'Sine Qua Non'. It's a bloody brilliant bacon saver.