paulgrover68 Posted April 13, 2021 Share Posted April 13, 2021 I thought I'd stack what I had - current around 3 hours. I want to add another 3. I'm just getting used to the new scope. I also decided to push the gain a bit to allow for less imaging time (BST + Work). Hoping a bit more data will give it some more "pop". I was usimg 5 minute subs and Starlinks killed around 10, which was massively annoying! 8 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 13, 2021 Share Posted April 13, 2021 49 minutes ago, paulgrover68 said: I thought I'd stack what I had - current around 3 hours. I want to add another 3. I'm just getting used to the new scope. I also decided to push the gain a bit to allow for less imaging time (BST + Work). Hoping a bit more data will give it some more "pop". I was usimg 5 minute subs and Starlinks killed around 10, which was massively annoying! Showing some nice colour creeping in on the outer arms. Setting gain can be tricky depending on your LP. High gain on dark skies with no LP is ideal. Once you start using high gain on LP skies, you amplify the signal, but also amplify the LP. When shooting OSC or broadband, I would err on the side of caution and go for longer exposures and lower gain, but that depends on your situation. Brian Quote Link to comment Share on other sites More sharing options...
paulgrover68 Posted April 13, 2021 Author Share Posted April 13, 2021 That's a super point Brian - I'm Bortle 4-5. I think 200 gain is the most I'd chance.I have noticed it just starting to soften things. I must admit, I've been using the L-eNhance for so long I forgot how much light the IDAS LPS filter let's through. Next round of galaxy shooting will be at unity I think. Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted April 13, 2021 Share Posted April 13, 2021 I’m in Bortle 7/8 and as Brian says higher gain results in amplification of light pollution especially with the OSC. So I now only shoot at unity which for both my cameras is oddly 111. But you get used to it. I have sometimes shot at 53 and recently 11! The latter due to a typo as I meant it to be unity. Also lower gain minimises the amp glow which my cameras are cursed with but which can be completely calibrated out. Great work so far on the galaxy Paul. 2 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 13, 2021 Share Posted April 13, 2021 17 minutes ago, paulgrover68 said: That's a super point Brian - I'm Bortle 4-5. I think 200 gain is the most I'd chance.I have noticed it just starting to soften things. I must admit, I've been using the L-eNhance for so long I forgot how much light the IDAS LPS filter let's through. Next round of galaxy shooting will be at unity I think. I believe the IDAS LPS is more suitable for LP from Led street lights. I am in Bortle 4, and I shoot gain 76 and offset 15 with my ASI 1600, and maximum 2 minute exposures on RGB and 1 minute on lum data. 1 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted April 13, 2021 Share Posted April 13, 2021 Some good detail starting to show. Definitely adding ore data will benefit. With the starlink issue, did you use sigma clipping during stacking or just excluded the tainted subs? Quote Link to comment Share on other sites More sharing options...
paulgrover68 Posted April 13, 2021 Author Share Posted April 13, 2021 16 minutes ago, MarkAR said: Some good detail starting to show. Definitely adding ore data will benefit. With the starlink issue, did you use sigma clipping during stacking or just excluded the tainted subs? I dropped them from this run. I was planning to try a stack with the least bad ones included - but then the sky cleared. I think I do have to play with some settings to maximsise my subs. Quote Link to comment Share on other sites More sharing options...
MarkAR Posted April 13, 2021 Share Posted April 13, 2021 Worth ditching bad subs but Windsorised Sigma Clipping works well on satellite streaks going through good subs. 2 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted April 14, 2021 Share Posted April 14, 2021 1 hour ago, MarkAR said: Worth ditching bad subs but Windsorised Sigma Clipping works well on satellite streaks going through good subs. I never remove any images with satellite trails, only those with streaked stars. I blink all my images to remove obvious bad ones, then subframeselector to remove high eccentricity and high FWHM frames. Quote Link to comment Share on other sites More sharing options...
paulgrover68 Posted April 14, 2021 Author Share Posted April 14, 2021 I'll try this tonight - I have another 2.5 hours of data to integrate and the satellites were rampaging through the frame early on. Quote Link to comment Share on other sites More sharing options...
Padraic M Posted April 14, 2021 Share Posted April 14, 2021 Great image for 3 hours. M101 is not easy! Quote Link to comment Share on other sites More sharing options...
Jkulin Posted April 18, 2021 Share Posted April 18, 2021 Paul, I found M101 quite hard to process and it took me 3 years before I managed to get a reasonable image, still far from perfect but don't give up because it is worth it. Here's my capture from last year, not brilliant, terribly frustrating: - https://www.astrobin.com/r4s23i/B/ 1 Quote Link to comment Share on other sites More sharing options...
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