B33 and NGC2024. The Horsehead and Flame nebulae. The sky was very clear on this evening, stars were visible down to magnitude five with only light pollution to contend with. I was using a 4 inch f/6.3 refractor, a Vixen Atlux mount PHD auto guiding, Astronomik filters H Alpha for image luminance combined with RGB for colour data and an Atik 383L mono CCD camera. I captured five minute sub frames with matching dark frames and combined them with flat field frames to reduce the effect of vignetting in the final image. The total exposure times were 120 minutes using a H Alpha filter and ten minutes for each RGB filter.
RGB
RGB stars eroded
