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I think I agree with you enough that I'll opt for the colour camera.
It will still need a filter, but only needs a single broadband filter rather than a filter wheel with multiple narrowband filters.
I can't quite figure out if it takes longer to acquire with a colour camera and doing many single full colour shots, or a monochrome camera + filter wheel doing shorter exposures per colour, but having to do far more exposures to get the info.
I think ultimately, that it's a quality thing... a monochrome camera being able to capture more pixels, more control over which narrow band colours to capture, and a hypothetically higher QE factor for the camera... but this also feels like diminishing returns, like something I should do far into the future when I know I need to, rather than something I would do now.
All of the cameras I'm looking at are cooled and have some temperature control going on.
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Velocio
If you are planning to start imaging over multiple nights then a temperature controlled camera would definitely be a good idea.
Given that you've gone with a quad scope to start with, your colour correction is there and realistically I'd be surprised if you would see the difference between a well set up OSC camera or a mono camera without real pixel peeping.