Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_30_second_exp_2_winners.thumb.jpg.b5430b40547c40d344fd4493776ab99f.jpg

turbolord

Members
  • Content Count

    32
  • Joined

  • Last visited

Community Reputation

42 Excellent

About turbolord

  • Rank
    Nebula
  1. Thanks for the comments. Updated with a slightly different workflow. I think the previous one the colour was a bit off.
  2. SO managed to finally get a clear night up here in sunny Scotland to try out my Xmas present before it gets wrapped. This is 32x300s exposures taken with a QHY8L mounted on the new Skywatcher Esprit 80 with the matching flattener.
  3. Spent a cloudy night learning some more tricks in Pixinsight and added some star spikes so my Newt doesn't feel left out.
  4. Updated it to have less of a blue background and more muted colours,
  5. Thanks maybe I should redo a more muted one. The lens was at 400mm and this is a cropped shot to remove some of the ugly star distortions around the edge.
  6. Hi, This is a image of M31 that I took on Saturday. It was taken with a Canon 100mm-400mm lens at f6.4. It comprises of 24x600s of exposure taken with a QHY8L. The blue cast is deliberate I corrected it out but my wife said she preferred it with the blue.
  7. Thanks. Because I am on a portable set up I have a problem getting the rotation correct between sessions. I need to find a way to get the camera at the right angle time after time (or else the diffraction spikes rotate). Problem with imaging in Scotland lots of clouds you only get an hour here and there.
  8. Hi, This is the Western Veil Nebula taken from the Galloway Astro Centre. This was 6x600s taken with a QHY8L with the 200PDS on a HEQ5. Guided with a QHY5 on a Altair Astro 60mm Mini Guide Scope. Thanks, Mark
  9. Hi, This is my first light on my QHY8L. Got about 70 minutes of H-alpha in 10 minute subs before the guider and the secondary dewed up. This was taken with a 200PDS with a QHY8L. Using a Baader 35nm filter. Thanks, Mark
  10. I don't debate that Mono camera have better spacial resolution but from a signal to noise point of view the answer is more complex. If you had a white light source illuminating the camera then the light reaching the mono pixels is set by the bandwidth of the filter that is used. The Colour camera pixels receive the same number of photons as the mono pixels (assuming the bayer filter transmission is similar to the filter on the mono camera) Since the camera is the same, the pixel S/N is the same. What really makes the difference is the Luminance channel gets up to 3 times as many photons giving you up to 4.7dB advantage on the L channel (Only for a white light source). For Narrowband imaging then again the signal to noise in the red pixels is slightly reduced (due to the loss of the bayer red filter and the H-alpha filter) but I expect this to be no more than 5-10%. The big addition of noise is that the green and clue channels now only have noise so the interpolation algorithms will I think merge the dark noise from the other channels into the red. Though haw much this occurs is dependant on the algorithm. Craig Stark did a great paper on Debayering techniques (http://www.stark-labs.com/craig/resources/Articles-&-Reviews/Debayering_API.pdf ) On multi-line nebulas the noise will be reduced on the colour camera as the green and blue channels will have information within them.
  11. Thanks Gina. I think I have had one night this year where the seeing has been as good as in this image. I wanted to see what aperture could do. I was amazed at the detail from only 30 mins. It does give me the taste for going down to http://www.scottishdarkskyobservatory.co.uk/ and renting the 20" beast off Robbie.
  12. Updated reducing the bad bloating on some stars and reducing saturation.
  13. Hi, This is a experimental image. The Luminance was only 30 minutes (6x300s) on Telescope 7 on the iTelescope network (a 17" CDK). The RGB is taken with a Canon 550D mounted on a 200PDS. and was 2.5 hours (15x600s). The original RGB image is here. and the merged LRGB is here. Still playing around and I'm not sure I have the colour quire right but still impressed with what I can get out of it. Thanks, Mark
  14. The once in a lifetime event of Scottish skies clearing during a astronomical event.
  15. Updated Flipped the picture. I think Pixinsight is using the wrong reference points for RAWs. Tried using layers to reduce Alnitak but couldn't work it out for another day I think. Added some more sharpening.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.