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how about you buy a filter wheel and use the QHY5L-II for RGB planetary as well as mono solar?
you can use the canon for deep sky (or even colour planetary) the main problem is that you need to modify it as Glen said (for more Ha sensitivity) and they are noisy as in summer.
People undertake cooling mods but if you're not hands on you may be better off getting a QHY8 or the like to get the cooling.
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