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I started off with a second hand 350d and got some great photos at prime focus with my ed80, without tracking. A good way to start IMHO.
That cost me $250 about 13 years ago. As Martin said a 10 year old 600d is a great entry to prime focus astronomy, on ebay body only can be found for two to three hundred dollars.
The Pixel 3a has a pixel size of 1.2 microns far smaller than the Canons 4.39 microns; and of course for astro the pixels stabilization is not useful.
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