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Is there a fixed lens camcorder that you would suggest as part of the equipment list? Maybe they are all too limited. I want something that has the option of a frame rate that allows great slow motion in post. I'd like 4K capability, but if there are other factors that are more important to the end product, I could let that go.
Fixed lens camcorders, in this age of digital cinema cameras, really only come into play when you absolutely need a doc style friendly camera with a sensor purposefully small to allow for the operator to pull focus, while at the same time having a crazy zoom range and built in audio.
They have major downsides in terms of IQ though, from poor color rendering to nonexistent depth of field control. You really only want one if you have zero control of the situation. Think news gathering. Anything else and there are far better compromises to be had.
I'm not really sure what you're using this for specifically, but 4k and slow motion don't often coincide. There aren't too many options with both, especially past 60fps. The Red epic and dragon are pretty much the only two cameras besides the phantom series that can handle 4k raw past 60fps without compromise. 4K prores is a different ball game though. The C500 can do 120fps in 4k.
But really, why do you need 4k? The most popular digital cinema camera in Hollywood right now, which I work with daily, the Arri Alexa, only shoots 2.8k and I bet you can't tell the difference between that and 6k dragon footage on a projected theater screen. Good 2k still beats bad 4k. Just look at the issues with the 4k Blackmagic camera.
If I were you I'd prioritize other things like color rendering, raw ability, slow motion capability, etc way ahead of the magic buzzword "4k", and see how that changes what cameras you may be considering.