The image is a combination of HA and Colour data.
Colour
Details
Canon 5DH, Canon 300mm F2.8L at f3.5 with external aperture. ISO 1600. Hutech LPR filter.
Exposures 20x(15s, 30s, 60s and 120s). Usual HDR method
HA Details
Astronomik 13nm HA filter
Exposures 20x(60s and 120s). Usual HDR method
Small image 3MB
http://d1355990.i49.quadrahosting.co...4/6334chaS.jpg
Full resolution large image 10MB
http://d1355990.i49.quadrahosting.co...04/6334cha.jpg
Both these nebula have their light attenuated by intervening dust so there is no Hbeta.
Bert