headkumquat
 lvl.3
Flight distance : 16060 ft
Canada
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Okay, boy did I get spanked! 
All the previous posters were correct in what they've said. If you want to shoot 120fps with your Phantom 3 it IS possible. The camera itself has the capability, but the hardware/software that gets the image to your MSD card isn't up to the task. I've heard a lot of P3 users who would love to see the transfer bus speed increased to it's potential. So DJI might eventually provide it. Seems they have other more pressing issues right now.
My original comment was based on heavier cameras used in the film industry, but the Hero black looks like an excellent option. As pointed out, it's light enough for the P3 to lift, and certainly seems to have the capacity to do outstanding high framerate video. Be prepared to spend some serious money on getting it, finding and installing a compatible gimbal, and getting it to work remotely from long distances without being able to use your P3 controller and Pilot app to do so.
aburkefl was correct in his evaluation of framerate/shutter speed. It's all about what looks good to YOU (and of course your client...if you have one). It also depends on how much post-work you do and what software you use to do it with. When you use double the frame rate for your shutter speed you create a ratio of 1 to 1. For example in a 1080p/60 situation, using a shutter speed of 120, you'd get 1 full frame of video every 1/60th of a second. I use Adobe After Effects, and this ratio, when combined with frame interpolation allows for a much smoother and cleaner slow motion footage as the inter-frame differences are more consistent. It's also easier to incorporate it into a 24p timeline if you're going for that look. So because of this, and other factors in my workflow, I tend to stay as close to the rule of thumb as I can. Assess your situation, find what works best, and stick with it (until something better comes along).
Tomtnt, hope you find a workaround to getting the exact look you want in your super slo mo footage
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