gabs Posted September 11, 2021 Share Posted September 11, 2021 (edited) Hi all, that is my version of the North America Nebula. 5.5 hours exposure 25O sec each frame + calibration frames using a Canon 1200 d Processed in Gimp to reduce LP and noise . I could have done much more with another night and more knowledges of processing on GIMP but I am happy with the result . Comments are welcome ! Edited September 11, 2021 by gabs 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 5 hours ago, gabs said: Hi all, that is my version of the North America Nebula. 5.5 hours exposure 25O sec each frame + calibration frames using a Canon 1200 d Processed in Gimp to reduce LP and noise . I could have done much more with another night and more knowledges of processing on GIMP but I am happy with the result . Comments are welcome ! It's looking good, you have captured a lot of nebulosity. What filter are you using? Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 8 minutes ago, AstronomyUkraine said: It's looking good, you have captured a lot of nebulosity. What filter are you using? Just the LP filter I don’t have any other! thanks a lot! Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 8 minutes ago, gabs said: Just the LP filter I don’t have any other! thanks a lot! Is it a clip in filter, or do you use a filter drawer? Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 8 minutes ago, AstronomyUkraine said: Is it a clip in filter, or do you use a filter drawer? Clip filter as attached which seems to do an excellent job helped with good calibration frames Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 6 minutes ago, gabs said: Clip filter as attached which seems to do an excellent job helped with good calibration frames It's a good filter for suppressing light pollution. You just need more integration time, or increase your iso to increase the signal. What iso are you currently using? Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 Just now, AstronomyUkraine said: It's a good filter for suppressing light pollution. You just need more integration time, or increase your iso to increase the signal. What iso are you currently using? ISO800 that is what I thought could be a good ISO also suggest from canon website. maybe longer exposures but I tried with a different ISO as well as longer exposure and it was too noisy. So far I happy of what I’ve got obviously I can do better 🙃 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 29 minutes ago, gabs said: ISO800 that is what I thought could be a good ISO also suggest from canon website. maybe longer exposures but I tried with a different ISO as well as longer exposure and it was too noisy. So far I happy of what I’ve got obviously I can do better 🙃 Are you taking darks, bias and flat calibration frames or just darks? Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 5 minutes ago, AstronomyUkraine said: Are you taking darks, bias and flat calibration frames or just darks? Yes I took darks, bias and flat frames as usual. This time I spent more time trying to get a better flat frame. it seems they help a lot to get a decent image! Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 4 minutes ago, gabs said: Yes I took darks, bias and flat frames as usual. This time I spent more time trying to get a better flat frame. it seems they help a lot to get a decent image! You'll probably find you will have less noise once it starts getting colder. The heat generated by a dslr accounts for a lot of the noise. 1 Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 2 minutes ago, AstronomyUkraine said: You'll probably find you will have less noise once it starts getting colder. The heat generated by a dslr accounts for a lot of the noise. I left 10 sec each exposure to rest the sensor if is not enough I can try to increase a bit more Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 13 minutes ago, gabs said: I left 10 sec each exposure to rest the sensor if is not enough I can try to increase a bit more How many calibration frames are you taking? Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 Just now, AstronomyUkraine said: How many calibration frames are you taking? 200 bias and 200 darks 100 flat frames. I tried to stack 200 flat with DSS but the result wasn’t so good Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 14 minutes ago, gabs said: 200 bias and 200 darks 100 flat frames. I tried to stack 200 flat with DSS but the result wasn’t so good Are you taking dark flats? Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 (edited) 9 minutes ago, AstronomyUkraine said: Are you taking dark flats? No I didn’t think I need them really. Are they different to the above? Edited September 11, 2021 by gabs Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted September 11, 2021 Share Posted September 11, 2021 12 minutes ago, gabs said: No I didn’t think I need them really. Are they different to the above? Yes you need dark flats, or else your flats won't be calibrated correctly. Dark flats as the same suggests, are dark frames taken at the same exposure length as the flat frames. Quote Link to comment Share on other sites More sharing options...
gabs Posted September 11, 2021 Author Share Posted September 11, 2021 Just now, AstronomyUkraine said: Yes you need dark flats, or else your flats won't be calibrated correctly. Dark flats as the same suggests, are dark frames taken at the same exposure length as the flat frames. Yes in that case yes I took them is the one I called simple dark frames not flat dark frames . Now I got what you meant. Yes I took them same exposure and setting as per lights frames but just put the dust cap to cover the scope. 1 Quote Link to comment Share on other sites More sharing options...
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