[Steve Phillipps]

Ryan, The 700 does slomo just fine from 720/60P material. Transcode it to ProRes HQ then put it through Cinema Tools to conform it to 24/25P. There is no reason why it should be jittery, as you have 60 full frames, you’re not making anything up or interpolating missing frames.
As for Nat Geo not accepting Varicam, I’m sure it’d be on a case by case basis, and it’s not a case of “cameramen wanting to shoot Varicam” as the subject requiring it. For natural history 60fps is an absolute bare minimum for a quality look to flying birds etc.
The only other options as it stands are the F23/SRW1 rig (huge and expensive) or now the new SRW9000 (not yet available, not so huge, but probably almost as expensive). The SRW9000 will do 1080/60P 4:4:4 to HDCam SR, that’ll do the trick nicely if you’re a millionaire, otherwise it’s still Varicam for now (eg the new “Planet Earth” series from BBC called “Frozen Planet” is largley Varicam 2700). They also bought a Phantom HD, another expensive and less than straightforward option for 1080/1000P!
Steve

[Steve Phillipps]

Very well done to Mike, it does look like a nice bit of kit.
Stephen, not sure what you mean by your question?
Steve