B33 The Horsehead nebula

Filter Test. Here we have B33 the Horsehead nebula, imaged 30 degrees away from the full moon under clear sky conditions. The total exposure time was 2 hours and twenty minutes. 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 filter was an Astronomik H-alpha filter.

This is a combination of old and new data. The total exposure time was 5 hours.