johnb 96 Posted September 23, 2011 Share Posted September 23, 2011 So as I was packing up there was M45 so I got 30 mins worth of 300 sec exposures along with Darks and Flats, a quick process and the result is below, oh using the kit in my signature Already I feel the stars are getting over exposed so can I solve this simply by taking shorter exposures but more of them to get the nebulosity or am I missing a process trick, I have heard of using star masks but im not sure if I fully understand how so use them (if they are the right answer) Thanks in advanceRegardsJohn B Link to post Share on other sites
Dann 10 Posted September 23, 2011 Share Posted September 23, 2011 I think thats a nice image. I was hoping to have a go at M45 this weekend, what ISO did you use? Would it be better to lower the ISO and stick to the long exposures? Link to post Share on other sites
MjrTom 19 Posted September 23, 2011 Share Posted September 23, 2011 Thats really nice.All my attempts on this target never turn out that good. Local LP kills the nebulosity of Merope.... Link to post Share on other sites
johnb 96 Posted September 23, 2011 Author Share Posted September 23, 2011 thanks for the feedback, I was using ISO of 800, maybe a lower ISO will do the trick, of course my other issue is that with my kit i cant get the complete M45 in my FOV so I will have to mosaic it - just oen thing after another.RegardsJohn B Link to post Share on other sites
Keiran 261 Posted September 23, 2011 Share Posted September 23, 2011 (edited) That is a very nice image... As you said it may be slightly over exposed (you seem to have lost a little coulor in the stars)I would be interested in what the settings were that you use for this? Expo time, ISO and amout of Expos I like the shot you got, its different to the full M45 in a good way Edited September 23, 2011 by Keiran Link to post Share on other sites
johnb 96 Posted September 23, 2011 Author Share Posted September 23, 2011 I would be interested in what the settings were that you use for this? Expo time, ISO and amout of Expos I took 6 x 300 second exposures at ISO 800 and combined in DSSRegardsJohn B Link to post Share on other sites
jgs001 1,174 Posted September 23, 2011 Share Posted September 23, 2011 I think that to get M45 and the stars is a tough challenge. You need the longer exposures to get the nebula to show up nicely, and you'll blow the stars in doing it. Perhaps taking a few shorter exposures (say 30 seconds) and blending a stack of those, for the stars over the nebula would work. I'm planning on having another go at M45 this year, and that's my intent. Link to post Share on other sites
johnb 96 Posted September 23, 2011 Author Share Posted September 23, 2011 blending a stack of thoseThanks, does one blend in the stacking or when processing ? Im using photoshop so any online tutorial would be greatThanksJohn B Link to post Share on other sites
jgs001 1,174 Posted September 23, 2011 Share Posted September 23, 2011 John, I plan to stack them separately and blend them in processing later. That's what I did with my Orion neb and trap last year. Link to post Share on other sites
johnb 96 Posted September 23, 2011 Author Share Posted September 23, 2011 thanksJohn B Link to post Share on other sites
Earl 1,283 Posted September 23, 2011 Share Posted September 23, 2011 There is a lot more there than you think Link to post Share on other sites
johnb 96 Posted September 23, 2011 Author Share Posted September 23, 2011 Wow, tell me what I did not do. This is great. John b Link to post Share on other sites
Earl 1,283 Posted September 23, 2011 Share Posted September 23, 2011 (edited) Using Pixinsight I did a Dynamic Background extraction, which helped remove the gradient, then boosted the Luminosity with Curves. Edited September 23, 2011 by Earl Link to post Share on other sites
johnb 96 Posted September 23, 2011 Author Share Posted September 23, 2011 Err right. I'm a photoshop person and I did a couple of iterations of levels just moving the black point a small amount each time time and then used curves a few time. I obviously need more practice. Thank for your explanation. Link to post Share on other sites
mark7331 11 Posted September 23, 2011 Share Posted September 23, 2011 John you can try adding shorter exposures but another technique is to make a star mask and then try stretching everything apart from the stars. You can pick up the nebulosity without blowing out the stars. Just be careful that you don't leave a dark halo round them.I did this in PixInsight by creating a star mask and adding a range mask to it so the larger star halos are included. I'm sure you can do this in Photoshop.Hope this helps.Mark Link to post Share on other sites
JimStan 11 Posted September 25, 2011 Share Posted September 25, 2011 Don't you just LOVE all the different results you can get with the same data ? ? ? Just one of the MANY fascinating aspects of digital photography ! I LOVE that image in post #11 !Jim S. Link to post Share on other sites
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