More than a twofer, but less than infinity, M52 is surrounded by HII regions, most famous, the Bubble NGC7536, then the Lobster Claw, Sh2-157, and the Cave, Sh2-155. Many lesser object, clusters NGC7510,7419, Sh2-154,161, nebula NGC7538, LBN 544,557, LDN 1218,1248, VDB 155 and the list goes on. Probably missed as many as I spelled wrong. Forgot, that nova, V1405 too. Anyway, just a short exposure with that amazing Rokinon 135f2 lens.
Exposure data, Rokinon 135mm f2 at f2.8 for 20/1 min
RGB w/IR cut, at f2.0 for 5/5min
Ha all thru Asi1600MC-cool camera at gain 200, offset 50, temp, -15C, no darks, flats, bias, only raw. Guided thru 4 inch f10 w/QHY5L-II mono at 2 sec rate riding on BigDog 16. Captured and stacked in Nebulosity, final in
PS CS5, posted image 80% full frame at 50% full size.
Clear skies,
Steve