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_constellations.thumb.jpg.6034fe99df7fe590f77a776877551964.jpg

gorann

Advanced Members
  • Content Count

    2,190
  • Joined

  • Last visited

  • Days Won

    3

gorann last won the day on November 26

gorann had the most liked content!

Community Reputation

2,263 Excellent

2 Followers

About gorann

  • Rank
    Brown Dwarf

Contact Methods

  • Website URL
    http://www.mn.uio.no/ibv/english/people/aca/gorann/index.html

Profile Information

  • Gender
    Male
  • Interests
    Astrophotography
  • Location
    Värmland, Sweden (59.77 °N)
  1. gorann

    NGC918 through a veil of cirrus

    Woow! That is a new one. The dust really adds a lot to the image and with a longer FL you would have missed it. So perfect FOV. Of course a bit frustrating to be reminded of all the great stuff we cannot see from up here.
  2. I see the bubble! Interesting. I think your image looks generally quite good. However, the dust looks a bit too smooth to me, almost glossy, and I cannot see any grains in it. Is that due to NR or maybe it is just downscaling to stop me from pixel peeping? The stars are better in the bottom part of the image than the top. You could try playing with spacers but maybe there is a tilt issue. Can tilt be adjusted on the ASI1600? On the ASI071 there are tilt adjustment screws but I cannot remember having seen them on the 1600.
  3. gorann

    m45

    It is a beautiful sparkling image, and in many systems halos from bright stars are unavoidible. Not even the Hubble Space Telescope can produce halo-free images of bright stars. Here is an example from the Hubble site, and the Hubble people are apparently proud of it:
  4. Looks good but the stars are a bit bloated. So I had a go at it in PS. The main difference from yours is probably that I protected the stars when I stretched it by selecting them with the select eye dropper and inverting the selection before the stretch (so stretching everything except the very brightest parts = stars). I did about 7-8 smaller stretches this way rather than one big one. Then some gradient exterminator. Also a bit of noise reduction (Neat Image plugin). I only had my laptop screen so not ideal processing conditions for me. To get more dust out and less noise you need more data but what you have already is quite nice.
  5. gorann

    California with small scope

    Very nice, especially considering you only have an hour of total exposure time. You caught quite a bit of structure in it, which is not that easy with just RGB. Ha would reveal more detail. You could consider investing in a clip-on Ha filter (https://www.firstlightoptics.com/astronomik-filters/astronomik-h-alpha-12nm-narrowband-ccd-filter.html) which I found works quite well with a DSLR on bright Ha objects like this one. On my Astrobin page (link below) you can see my attempts on the California nebula using a Canon 60D and mixing RGB with Ha imaging. If you have another go at it I suggest that you turn the camera 90° to catch more of the nebula.
  6. I think it looks quite good Rodd, as long as you refrain from pixel peeping (for that you need more data). It is a striking object and I like the wide field so I think it woul be worth while to get more data if you have more nights where you can leave it running after midnight. More data would possibly also bring out more interesting structures in the sky.
  7. gorann

    NGC 1579

    Very nice and interesting image Bob! As you say you can most likely get more out of the background to better reveal the dark nebulosity.
  8. gorann

    NGC 1333 lum.....done?

    Great image Rodd! I assume you have seen the other thread revealing that there is a dwarf planet travelling through your image:
  9. gorann

    First LRGB -M45

    Wim & Olly, @wimvb@ollypenriceto my defense I can say that the curve I posted was not exactly the one I used for the image but one I later made up to show my point, but I can see now that it does not have the best shape. When I use curves I of course look at the image to see how it is affected (i.e. if it looks better) and if parts look better and others do not then I only apply the good parts using layer masks and the brush tool.
  10. gorann

    First LRGB -M45

    I also often also do as Olly @ollypenrice describes and stretch the stars separately and use layer masks to put them in. However, I am not sure what you mean by a negative curve Olly - I thought that was when you allowed sections of it to fall downhill. I know that such curves can create bizarre effects, but the curve I showed above is always increasing towards the right so it should not invert parts of the histogram - or am I missing something?
  11. gorann

    Another M33

    If you have not tried the lab color method for color adjustment it is done like this: Go to the top menu and chose Image -> Mode -> Lab Color Then go to curves and chose first the a channel and anchor the curve in the middle and drag it up and down and see what is does to your image. Then do the same with the be channel. You can go back and forth between a and b until it looks ok. This is what it looks like with the central anchorpoint (in PS CS5 for Mac) and points on each side to move the curves up or down. Afterwards you go to Image -> Mode -> RGB and continue playing with the image. A good start is to see what you can do with the magenta using Selective Color. Hue/Saturation is probably also something to play with. Göran
  12. gorann

    Another M33

    Great detail there but a bit pinkish as the others pointed out. Hope you do not mind that I checked if I could adjust the colour away from pink using PS. First by making it into a lab color image and playing with the a and b curves (after anchoring them in the center) and then turning it back to RGB and using Selective Color to move the magenta towards yellow. Finally I used Gradient Exterminator to even out the background a bit. This was just a quick and dirty test to see what can be done and you can probably do it better on your full 16 bit version.
  13. gorann

    Espirit 120

    Interesting, let us know what they say! In any case, I assume it could be fixed with something with a high friction like a thin sheet of rubber (maybe cut out of bicycle tires).
  14. gorann

    First LRGB -M45

    Looks better David, with much more dust and nebulosity. However, if you compare the stars in your latest version with the ones in mine you can see that they are more bloated. If you want to avoid this you need to apply a stretch where you only increase the brightness of the central part of the histogram. In PS the curve I applied looked like this:
  15. gorann

    First LRGB -M45

    Yes, nice image and data. In addition to the background being a bit red I also thought that with the amount of data you have you should be able to bring out a bit more of the faint nebulosity. I played a bit with your 8 bit jpg file in PS to neutralize the background and also gave it a stretch with curves to bring out a bit more nebulosity. I am sure you could do it better from a non-compressed 16 bit file. Sorry for messing with your image but I am a few thousand miles from my gear (working in Vietnam for two weeks) and got itchy processing fingers.....
×

Important Information

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