Tibbz2 Posted April 29, 2014 Share Posted April 29, 2014 Taken on saturday night, gave up with M82 as it just looks like an over-exposed slug on my laptop screen, so got M81 looking the best I could instead! Focus was better than the last attempt but still not the best. 125 x 90 second subs 50 darks Link to comment Share on other sites More sharing options...
+RonC Posted April 29, 2014 Share Posted April 29, 2014 What did you use to process it Tobias? Link to comment Share on other sites More sharing options...
dawson Posted April 29, 2014 Share Posted April 29, 2014 Bliney tibbz, that is impressive, both the number of subs and the lovely results given scope! Great stuff. Jd Link to comment Share on other sites More sharing options...
Tibbz2 Posted April 29, 2014 Author Share Posted April 29, 2014 What did you use to process it Tobias? I used GIMP (or tried to anyway) Thanks James Link to comment Share on other sites More sharing options...
+RonC Posted April 29, 2014 Share Posted April 29, 2014 How did you find using it? Did you know there's a free download of Photoshop CS2 available? Ron Link to comment Share on other sites More sharing options...
oldfruit Posted April 29, 2014 Share Posted April 29, 2014 Nice result Tobias, some good detail in M81 Link to comment Share on other sites More sharing options...
xanthic Posted April 29, 2014 Share Posted April 29, 2014 I had a look and I think CS2 has been dropped. They are difficult to process as a pair, quite different brightnesses. Nice job Link to comment Share on other sites More sharing options...
Tibbz2 Posted April 29, 2014 Author Share Posted April 29, 2014 I like GIMP Ron, used it for a while now so used to it... Thanks Mark, Leigh Link to comment Share on other sites More sharing options...
Daz Type-R Posted April 29, 2014 Share Posted April 29, 2014 Nicely done. Question, as I'm a dirty visual monkey, excuse me for asking this (or tell me to shut up ) I thought there was a limit to how many darks you could use in a given image? I have a figure of around 20 knocking around my head. Is this correct, and if you do use more than 20 darks, is it a waste? (Or have I got it all completely wrong) Still a great picture though! Link to comment Share on other sites More sharing options...
Tibbz2 Posted April 29, 2014 Author Share Posted April 29, 2014 Nicely done. Question, as I'm a dirty visual monkey, excuse me for asking this (or tell me to shut up ) I thought there was a limit to how many darks you could use in a given image? I have a figure of around 20 knocking around my head. Is this correct, and if you do use more than 20 darks, is it a waste? (Or have I got it all completely wrong) Still a great picture though! Can't say I know, I just usually take about half as many as I have lights, don't know very much about the specifics! Hopefully someone knows! Link to comment Share on other sites More sharing options...
xanthic Posted April 29, 2014 Share Posted April 29, 2014 (edited) You can use as many as you want but the law of diminishing returns kicks in, so more (after a certain point) isn't always better. Edited April 29, 2014 by xanthic Link to comment Share on other sites More sharing options...
+RonC Posted April 29, 2014 Share Posted April 29, 2014 I heard 17 was the number?? I never have time totake more than 15 anyway! Link to comment Share on other sites More sharing options...
Sheila Posted April 29, 2014 Share Posted April 29, 2014 Nicely done. Question, as I'm a dirty visual monkey, excuse me for asking this (or tell me to shut up ) I thought there was a limit to how many darks you could use in a given image? I have a figure of around 20 knocking around my head. Is this correct, and if you do use more than 20 darks, is it a waste? (Or have I got it all completely wrong) Still a great picture though! think the figure i was told was 21, but flats and bias i do 20 dont do darks Link to comment Share on other sites More sharing options...
Johnnyaardvark Posted April 29, 2014 Share Posted April 29, 2014 Really nice work Tobias. Loads of detail on M81. I always feel it's "kind of cheating" but either in Gimp or PS you can work on layers and process your slug independently. Worth a play if you want to bring out the detail in that. Arguably is this where astrophotography becomes more art? I had a look and I think CS2 has been dropped.They are difficult to process as a pair, quite different brightnesses. Nice job CS2 is still available (recently "looked") but I have my suspicions it's a little questionable whether of not it's completely legal. It may have been made available for users who already had I licence. Don't know if that is confirmed. Steve Link to comment Share on other sites More sharing options...
xanthic Posted April 29, 2014 Share Posted April 29, 2014 Here's some reading on image processing for you. Info on darks about halfway down the page - http://deepskystacker.free.fr/english/theory.htm Link to comment Share on other sites More sharing options...
+Ibbo Posted April 30, 2014 Share Posted April 30, 2014 (edited) with my H9 darks made the image worse and I follow same for the 694 when i do cali frames i only do bias and flats and I do 50 of each but they only take a few minutes law of diminishing returns I think and good flats are more useful not sure where the odd number of darks comes in when I do DSLR I do a few darks up to 16 if i have time and again good flats are more useful and the most important thing is good data to start with I see a lot of posts here and there banging on about cali frames and they almost always forget to say if the light frames are crap no matter how many cali frames you use the image will be crap good data will give a good image but it can be wrecked by poor cali frames sort out PA PA PA focus focus focus then worry about the cali frames what you have done with the scope is very good and don't worry about the corners , with a DSLR you will get coma that looks like bad tracking sort out the middle where the object is and crop the bad bits out Edited April 30, 2014 by Ibbo Link to comment Share on other sites More sharing options...
Guest devil74 Posted April 30, 2014 Share Posted April 30, 2014 Nice Tibbz...a nice core and detail in M81 there, well done. Link to comment Share on other sites More sharing options...
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