Slow motion and frame rate and shutter speed

I have two cameras that record 60i and three that use 30p. Neither of the 60i cameras has a 30p option (one has a pf30).  If I understand how FCPx handles this, if I drop both frame rates into a project, I get 30p out, correct?  In effect de-interlacing the 60i footage to 30p. Is it best to import the 30p footage first to set that frame rate so that the 60i gets rendered to 30p?
We're producing a fishing DVD so good quality motion footage is important. This is an instructional DVD so I will be using some retiming to slow footage down to illustrate key points in the instruction.
I've read a lot of stuff on 1080i 60i vs. pf30 vs.30p vs. 24fps and benefits of using 720p vs. 1080i.  Also looked at information on slow vs. fast shutter speeds.
So, the bottom line to get the best motion results for the DVD, I should be shooting at best bit rate possible, use 1080i 60i or 30p depending on the camera and let FCPx set everything to 30p.  Correct?

For the 1080/60i media, it is best to have FCPX conform it to 30p (29.97p). [30p is a real timing: 30 exact frames per second, but it is not broadcast compliant. 29.97 is quite often simply referred to as 30, just for simplicity and/or laziness. The final decision for which to use rests with you. Also note, like "30 fps", 60 more often refers to 59.94 fps... for the same reasons.]
As for your target being DVD: DVD is always 480 lines whether it is anamorphic (16:9) or standard 4:3. If you would like to have "enhanced" slow motion, my recommendation would be to shoot in 720/60p (which is genuinely progressive "60" frames per second) and will give a slightly better edge on slow motion effects (retiming). That said, FCPX retiming is usually quite good no matter what the frame rate (frame blending recommended over optical flow [which tends to give a "morphing" effect when pushed too far].)  1280x720 frame size will give you plenty of downsampling resolution for DVD as well.  [I *believe* that FCPX will use all of the 60fps available from the original video in retiming, even if the frame rate of the project is slower than the original media; so, 720/60p conformed to a 30p project and retimed to 50% will use every frame of the 60p slowed down by half... (somebody correct me if I'm wrong!)]
Best bitrate is also an important feature, but that is not due to the choice of format as much as that provided by the camera itself. Bitrates out of the camera may be relative to the frame size (they are in my consumer camcorders). A common consumer grade camcorder will top out at a bitrate (for 1080) somewhere between 17.5 and 22.5 Mbps, whereas an HD capable DSLR will usually top out at (easily) *twice* as much (45Mbps average from my Canon T4i) or more. Furthermore, the DVD standard imposes framerate restrictions (max is somewhere between 5 and  8Mbps -- the software that creates your DVDs will usually transcode for best bitrate, so not something you really need to bother with - just set the transcoder to best possible quality and provide it with the best quality video that's reasonable.) Whichever camera provides the highest bitrate should be your "main" camera.
As you may have discovered: another factor for a quality video regardless of camera is shutter speed. If you set the shutter speed too high (faster than twice the frame rate) then you will have "stuttering" issues (there will be "gaps" from still frame to still frame). Keep the shutter speed at the same or no more than twice the frame rate: e.g., for 1080/30p (target) the shutter speed should never be more than 1/60th of a second (I'll use 1/30th, 1/40th, or 1/50th usually). I haven't shot a lot of 720/60p, but I think I would still keep the shutter speed at between 1/60th and 1/120th exclusively [that is -- I wouldn't go as high as 1/120th or greater... but that's me... you should experiment for best results for you.  If this creates exposure issues, then consider neutral density filters or circular polarizing filters to help bring scenes into exposure range (via aperture or iso or both.)
HTH
Good luck! Have a good shoot!

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