ispookie666 Posted September 5, 2021 Share Posted September 5, 2021 (edited) Just about managed to setup my rig. Was trying to photograph the Soul Nebula. Nikon d5000, ISO 400, 45sec, Tokina 105mm F2.8 No filters. Mount - CG5 with EQStar EQ5, PHD2 tracking using ZWO 120 as guide camera The below image is a output straight from DSS - I think 70 frames, some dark bias and flat frames I thought I might be getting a lot more data after stacking - any pointers? or what I should be doing differently? Edited September 5, 2021 by ispookie666 adding more info Link to comment Share on other sites More sharing options...
Adam J Posted September 5, 2021 Share Posted September 5, 2021 6 minutes ago, ispookie666 said: Just about managed to setup my rig. Was trying to photograph the Soul Nebula. Nikon d5000, ISO 400, 45sec, Tokina 105mm F2.8 No filters. Mount - CG5 with EQStar EQ5, PHD2 tracking using ZWO 120 as guide camera The below image is a output straight from DSS - I think 70 frames, some dark bias and flat frames 712.38 kB · 0 downloads I thought I might be getting a lot more data after stacking - any pointers? or what I should be doing differently? Well that looks like the double cluster so I think that you are a little off target. Link to comment Share on other sites More sharing options...
ispookie666 Posted September 5, 2021 Author Share Posted September 5, 2021 3 minutes ago, Adam J said: Well that looks like the double cluster so I think that you are a little off target. Lol way off mark then. Thank you. Link to comment Share on other sites More sharing options...
Budgie1 Posted September 5, 2021 Share Posted September 5, 2021 6 hours ago, ispookie666 said: Lol way off mark then. Thank you. You're not that far off. I put your image through Astrometry.net and the Soul Nebula is within your FOV. How did you process your stack of 70 x 45s images? It looks like it's either not stretched enough or you've clipped the black and made it too dark to see any nebulosity. If you could post the unprocessed stacked image and we can have a look. Link to comment Share on other sites More sharing options...
ispookie666 Posted September 6, 2021 Author Share Posted September 6, 2021 The second image is straight out of DSS. It looked so dark, hence not looked into processing Link to comment Share on other sites More sharing options...
Budgie1 Posted September 6, 2021 Share Posted September 6, 2021 The DSS output file should be a .tif or .fit format file, could you upload that as the one in your post above is a .jpg. 1 Link to comment Share on other sites More sharing options...
alacant Posted September 6, 2021 Share Posted September 6, 2021 42 minutes ago, ispookie666 said: It looked so dark, hence not looked into processing Ah, ok. Now I understand... It looks dark because you haven't processed it. Link to comment Share on other sites More sharing options...
ispookie666 Posted September 8, 2021 Author Share Posted September 8, 2021 Soul Process 3.TIF Tif file from DSS Link to comment Share on other sites More sharing options...
ollypenrice Posted September 8, 2021 Share Posted September 8, 2021 Here's your widefield image with my rather less widefield superimposed on it. The Heart and Soul are in there, as you can see, but you have to get them to show via processing. Olly Link to comment Share on other sites More sharing options...
vlaiv Posted September 8, 2021 Share Posted September 8, 2021 Something is wrong with the data and I can't quite tell what it is. I guess it is down to stacking process. Did you by any chance use median as stacking method (that is just wild guess - I have no idea what might cause that)? Here is what I mean by strange data - all channels have odd histogram - here is red for example: Normal stack should have single histogram peak near background value. This one has 6 humps - three quite prominent. Similar thing happens with other channels. When zoomed in and linearly stretched - background shows posterization instead of normal noise: Could it be that you shot 8bit images instead of 16bit, or used jpeg instead of RAW? Maybe in camera noise reduction was turned on so each sub ended up being filtered? Link to comment Share on other sites More sharing options...
vlaiv Posted September 8, 2021 Share Posted September 8, 2021 7 minutes ago, ollypenrice said: The Heart and Soul are in there, as you can see, but you have to get them to show via processing. I'm afraid that is not possible with this data - faint signal has been lost due to something and I can't really tell what it is. Link to comment Share on other sites More sharing options...
vlaiv Posted September 8, 2021 Share Posted September 8, 2021 I really gave my best and it only possibly shows hints of both Heart and Soul (in reality it only shows dark features around them than actual nebulosity - compare with Olly's image above). This has been binned x6 in order to attempt to pull out any sort of signal from the background. Link to comment Share on other sites More sharing options...
ispookie666 Posted September 9, 2021 Author Share Posted September 9, 2021 Thank you for the inputs. I honestly have no idea about the median! What should I be using? I'll check my DSLR and find out more. I had another go tried my SW 200DPS, just could not get tracking to work, used a 250mm lens f6.3, the results were even worse. I'll stick to my tokina or give the skywatcher 200 another go. Thank you once again. Link to comment Share on other sites More sharing options...
alacant Posted September 9, 2021 Share Posted September 9, 2021 On 05/09/2021 at 18:21, ispookie666 said: Nikon d5000 Hi To get the soul nebula to show, best to remove the hot mirror from the camera. Cheers and HTH 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now