Pinwheel Galaxy - large face-on spiral in Ursa Major; low surface brightness, needs long exposure. ~21 million ly.
Scope: ~2104mm: 127-150mm Mak/SCT (+Barlow)
Camera: Colour OSC (e.g. IMX533/585) + UV/IR cut
Exposure: 60-120s subs, 2h+ total (guided)
