Besides the Sony FS700, what are some other camers that can do high frame rate recording (240+ fps)? I know some can do 120/180, but do you have to step into speciality cameras beyond this ?
If you're fine with "just" 240fps, the VariCam LT can do 240fps in 2k/HD internally, albeit in a cropped sensor mode. The F55 can do 240 in 2K RAW to an R5 or R7 recorder, with no sensor "crop".
Worth checking out the Slow Mo Guys channel. They actually have an episode where they visited Vision Research, the company that makes the Phantom cameras and they go pretty deep into the models and how they are built and tested. Fascinating stuff. Gav often will talk about which Phantom they are using to get a particular frame rate. https://www.youtube.com/channel/UCUK0HBIBWgM2c4vsPhkYY4w
Some rental houses who rent Phantoms won't rent them to you unless you have a qualified, certified, trained Phantom Technician on set. I've done it a few times over the years, not cheap to rent either. Amazing technology but you really have to have a need for it to justify how much it costs to rent one.