gabs Posted August 31, 2021 Share Posted August 31, 2021 Hi, just finished to stack 30 exposures of the M15 at 200 sec each.+ bias , dark and flat frames I like to see how many stars can be caught in the image. As usual please feel free to comment! 6 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted August 31, 2021 Share Posted August 31, 2021 Nice, I do like a cluster! 1 Quote Link to comment Share on other sites More sharing options...
gabs Posted August 31, 2021 Author Share Posted August 31, 2021 5 minutes ago, PeterBolt said: Nice, I do like a cluster! I like it too . it can be easy target for beginner I hope to do more ! thank you! 1 Quote Link to comment Share on other sites More sharing options...
Padraic M Posted August 31, 2021 Share Posted August 31, 2021 Very nice! That's a real success. The stars look very sharp to my eyes at least, and you've managed to control any LP gradient. One thing I would say is that your background is black whereas you really want it to be dark gray with some small dynamic range. Make sure you're not clipping your black points (left-hand side of the histogram) when you're stretching. 2 Quote Link to comment Share on other sites More sharing options...
gabs Posted August 31, 2021 Author Share Posted August 31, 2021 47 minutes ago, Padraic M said: Very nice! That's a real success. The stars look very sharp to my eyes at least, and you've managed to control any LP gradient. One thing I would say is that your background is black whereas you really want it to be dark gray with some small dynamic range. Make sure you're not clipping your black points (left-hand side of the histogram) when you're stretching. Thank you very much for advise and comment! 🙂 every little progress means a lot to me! 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted August 31, 2021 Share Posted August 31, 2021 6 hours ago, gabs said: Hi, just finished to stack 30 exposures of the M15 at 200 sec each.+ bias , dark and flat frames I like to see how many stars can be caught in the image. As usual please feel free to comment! Your stars are looking very good. Maybe your exposure time is a little high, the core of the galaxy is blown. Quote Link to comment Share on other sites More sharing options...
gabs Posted August 31, 2021 Author Share Posted August 31, 2021 4 minutes ago, AstronomyUkraine said: Your stars are looking very good. Maybe your exposure time is a little high, the core of the galaxy is blown. Thanks ! Yes I like the stars around the core in the cluster itself can be improved a bit. Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted August 31, 2021 Share Posted August 31, 2021 2 minutes ago, gabs said: Thanks ! Yes I like the stars around the core in the cluster itself can be improved a bit. When you see no colour in your stars, it usually means they are blown, or overstretched. 1 Quote Link to comment Share on other sites More sharing options...
gabs Posted August 31, 2021 Author Share Posted August 31, 2021 1 minute ago, AstronomyUkraine said: When you see no colour in your stars, it usually means they are blown, or overstretched. My knowledge of GIMP needs to be improved a lot. So I keep practising until I achieve a good result. I hope soon! Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted August 31, 2021 Share Posted August 31, 2021 9 minutes ago, gabs said: My knowledge of GIMP needs to be improved a lot. So I keep practising until I achieve a good result. I hope soon! I know nothing about Gimp at all, except it's free. 😀 1 Quote Link to comment Share on other sites More sharing options...
gabs Posted August 31, 2021 Author Share Posted August 31, 2021 14 minutes ago, AstronomyUkraine said: I know nothing about Gimp at all, except it's free. 😀 That is why I am using it! 1 Quote Link to comment Share on other sites More sharing options...
Carastro Posted August 31, 2021 Share Posted August 31, 2021 Well done Gabs, the stars are beautifully round. I forgot to mention when I was giving your advice about length of exposures that you don't need 300secs with star clusters. Getting the core of globular clusters right is tricky for a beginner, and needs gentle processing in layers really to keep the core from burning out, and/or exposures of shorter length combined for the core. Carole 1 Quote Link to comment Share on other sites More sharing options...
gabs Posted August 31, 2021 Author Share Posted August 31, 2021 4 minutes ago, Carastro said: Well done Gabs, the stars are beautifully round. I forgot to mention when I was giving your advice about length of exposures that you don't need 300secs with star clusters. Getting the core of globular clusters right is tricky for a beginner, and needs gentle processing in layers really to keep the core from burning out, and/or exposures of shorter length combined for the core. Carole Thanks Carole I will do next time! Quote Link to comment Share on other sites More sharing options...
MarkAR Posted September 4, 2021 Share Posted September 4, 2021 A nice start for a globular, well worth experimenting with exposure times and combining say 60s for cores with 120s for the fainter stars. Will depend a lot on the magnitude of the cluster as to what times are best for your set up. 1 Quote Link to comment Share on other sites More sharing options...
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