This huge nebula is around the star Lamda Centauri (near the middle).
2 panel mosaic showing more than 2x2 deg of the sky.
HA RGB image.
50: 10:10:10 min for each panel total of 160 min for the whole mosaic.

Imaged with the Boren-Simon 8" F2.8 POWERNEWT Astrograph.
SBIG ST8300M with FW5 filterwheel with BAADER HaLRGB filters
Imaged from Tivoli farm in Namibia June 2011