60i

Your scene file settings should be the same for everything except frame rate.

Keep in mind that 60i reads more light, so you'll have to stop down the iris a little bit to match the exposure in the 24p.
 
The scene settings are customizable. In fact if you used 60i in the fx setting you would have to have customized it. That works as all the other settings are the same, but its a bit putsy to have to go into the menu. What I did was customize scene setting 4, 5 and 6, with all the same settings except for the frame rate. So 4 is 60i, 5 is 30p 6 is 24pa. Then I just switch scene settings for the frame rate i need for the shot.
*Note- Scene Settings can't hold shutter speed settings. So when you go to 60i you'll have to change to 1/120 for slowmotion that looks like it was shot with film (in terms of motion blur)
 
Actually, it's better to adjust the exposure by changing to 1/120th. It'll compensate for the additional brightness of 60i, plus it'll give you the motion rendition that matches film shot at 60fps.

The 60i technique will make for the smoothest slow motion, but keep in mind that your shots will be noticeably softer in vertical resolution. Using 30p and playing it back at half-speed will preserve the full vertical resolution, but the motion won't be as smooth. So you have to pick which aspect is more important to you.
 
But then, if I shoot 24P and 60i on the same tape, when I capture, is it OK to just capture the whole tape on one timeline?

Also, if I shoot 60i and make it slow-mo, wouldn't it look NOTICEABLY different than the 24P shots?
 
If you slow it down to where it's playing at 40% speed, it'll look like a slow-motion shot, so yes obviously it would look noticeably different -- it'd be playing at super-slow-mo.

Also, it would be substantially lower vertical resolution.

But if you're asking if it would look "video", no it wouldn't look video at all. It would look like you'd shot film at 60fps and played that film back at 24fps.

As far as the capture question, that's a question for your NLE. Vegas would handle it easily; I don't know whether other editors handle it appropriately or not.
 
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