NGC6823

Grainy because I forgot to turn on dithering here. Also, I realized that with an uncooled DSLR, it doesn't make sense to use exposures longer than 300 seconds, as the noise becomes overwhelming. Or you have to lower the ISO to 100.

And even 300 seconds is too much. Two minutes maximum. After that, the noise becomes so strong that nothing can remove it.

That's exactly why I want a new astro camera with cooling. I'm saving up for it.

The camera's advantage is a much larger sensor (about 4 times bigger) and autonomy.

Well, it depends on the astro camera. For example, the ZWO 2600 MC PRO actually has a slightly larger sensor. So the ZWO 533 MC PRO doesn't count.

That's true, but it also costs as much as a Boeing wing. :) For that money, you could buy 5 cameras.
Although, of course, the sensors in regular Canons aren't designed for astrophotography and deliver what they're capable of.