[Tandum (Robin)]

Can't beat a big dob/newt for value H.
They are cheap so you don't mind screwing with them.
They got a decent FL and suck in buckets of light.
Fiddling with coma correctors and managing weight is the drawback I guess.

This is what a full frame looks like with an 8300 sensor, I haven't fixed it, just for a look.
I'm having another go tonight with the tak@f8 but you'll never get the detail from a lens that you can with a big mirror.
Those 2 tiny galaxies beside it are both around mag 16 (easier to see them in the fixed image above).
I doubt I'll see them at all in the tak image.