Ptolemy Cluster - big, bright open cluster in Scorpius, visible to the naked eye and known since antiquity. ~980 ly.
Scope: ~2274mm: 127-150mm Mak/SCT (+Barlow)
Camera: Colour OSC (e.g. IMX533/585) + UV/IR cut
Exposure: 30-60s subs, 1h+ total
