Hello group,
here is the Triangulum Galaxy M33 in hydrogen-alpha, a quite unusual
target.
Instrument: BRC250 F=1268mm + SBIG-ST10XME + filter 6,3nm
Exposed: 4 x 1800seconds (2h):
Interesting comparison with another shots, but made the exact same
setup with luminance filter:
All the best
Danilo Pivato