B33. The Horeshead nebula.

B33. The Horeshead nebula. This image was taken under clear light-polluted sky conditions with stars visable down to magnitude 5. I was using my ten inch f/4.8 reflector, a Vixen Atlux mount, P.H.D. auto-guiding , an Atik 383L mono CCD camera and a set of Astronomic narrowband filters.
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 filters I was using were SII, OIII and H-alpha, with a total exposure time of 50 minutes for each filter.

Horsehead and Flame nebula in narrowband

Horsehead and Flame nebula, narrowband luminance + RGB

B33 narrowband