M 42 The Great Orion Nebula

Equipment:
William Optics GT81 IV, 0.8x reducer, ASI1600mm, Chrome 3nm Ha, SIi
William Optics GT81 IV, 0.8x reducer, ASI1600mm, Astronomiks 6nm OIII
EQ6-R Mount

HA : 5.5 hr
OIII : 3.75 hr
SII : 2.66 hr