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I say if you're really keen and think you'll stick it out, get a cooled mono camera and filters (LRGB, at least) straight away. If you're just dabbling and making up your mind then a DSLR is just fine.
My DSLR phase lasted about one night. Nothing wrong with astro imaging with a DSLR but if you're really serious you'll end up with a mono camera before long, especially if you want to try narrow band imaging. If your home skies aren't great then NB may be the only way you'll get any decent images from a convenient and easily accessible location.
Cheers,
Rick.
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