More data on NGC2024 and B33. The Horsehead and Flame nebulae.

NGC2024 and B33. The Horsehead and Flame nebulae. I took this image on four separate evenings  under very clear sky conditions stars were visible down to magnitude 5.2.  The total exposure times were 30 minutes using a blue filter, 45 minutes using an S11 filter, 65 minutes using an O111 filter and six hours using a H Alpha filter. 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 telescope I was using was a 4 inch f/6.3 refractor, with  a Vixen Atlux mount, PHD auto guiding, A set of Astronomik narrowband, RGB filters and an Atik 383L mono CCD camera.

Hubble palette

Hubble palette + RGB colour

RGB colour, narrowband luminance

Final composition

The Horsehead and Flame nebulae

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

IC1318 The Butterfly nebula

IC1318 The Butterfly nebula . The patch of nebulosity lies in the constellation of Cygnus the Swan . The bright star in this image is Gamma Cygni . The sky was particularly clear on this evening with stars visible down to magnitude five. I was using a 4 inch F 6/3 refractor , a Vixen Atlux mount,, PHD auto guiding , an Atik 383L mono CCD camera a set of Astronomik narrowband filters S11, HA , O111 and RGB 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 total exposure times was 60 minutes using a H Alpha filter 20 minutes using an S11 filter and 20 minutes using an O111 filter. 

Hubble Palette

RGB

Final result of NGC6888 and the Soap Bubble nebula

Here we have the final result of NGC6888 and the Soap Bubble nebula. An extra four hours of H Alpha luminance has been added giving a total exposure time of twelve and a half hours.

NGC6888 the Crescent nebula and PNG75.5+ 51.7 the Soap Bubble nebula.

NGC6888 the Crescent nebula and PNG75.5+ 51.7 the Soap Bubble nebula.  I consider this as a very challenging target because of its low surface brightness. It was first discovered in June 2007 from the Mount Wilson Observatory in California using a six inch refractor, a CCD camera and a H Alpha filter. I took this image on four separate evenings with no moon light to contend with under very clear sky conditions. Stars were visible down to magnitude five. The telescope was using was a 4 inch f/6.3 refractor on a Vixen Atlux mount, PHD auto guiding, an Atik 383L mono CCD camera and Astronomik filters, H Alpha , O111 for the luminance data. I also used RGB filters to reveal the colours of the stars. 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 four hours for each narrowband filter, H Alpha and O111, and ten minutes for each RGB filter.

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Hubble palette

Hubble palette + RGB

RGB colour narrowband luminance

Soap bubble super enhanced

NGC6992 The eastern Cygnus Loop

NGC6992  The eastern Cygnus Loop. This image was taken under hazy sky conditions with bright moon light and light pollution to contend with, stars were only visible down to magnitude 3.5. I was using a set of Astronomik narrowband filters S11, O111 and HA combined with RGB filters . I was also using a 4 inch f/6.3 refractor, a Vixen Atlux mount, PHD auto-guiding 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 50 minutes using a HA filter, 40 minutes using an O111 filter, 30 minutes using a S11 filter, and 10 minutes using each RGB filter.

Bi-colour image

Hubble Palette

RGB + Hubble Palette

Narrowband luminance RGB colour