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): http://www.danilopivato.com/tabulae_...m33_brc_ha.htm Interesting comparison with another shots, but made the exact same setup with luminance filter: http://www.danilopivato.com/tabulae_...30/m33_brc.htm All the best Danilo Pivato www.danilopivato.com