PeterBolt Posted March 17, 2021 Share Posted March 17, 2021 (edited) I made a start on NGC 2903 last night and managed to grab a couple of hours once the wind had calmed down. It was also the first time out for the new low profile focuser and coma corrector - at last I have round stars! I'm hoping to have another go tonight 🤞 Edited March 17, 2021 by PeterBolt 4 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted March 17, 2021 Share Posted March 17, 2021 Very nice, little bit more data will be a bonus. Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 17, 2021 Author Share Posted March 17, 2021 Thanks it's looking clear again tonight so I'm hoping to catch another couple of hours. Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 18, 2021 Author Share Posted March 18, 2021 (edited) I managed to capture another 3 hours of data last night so these images were made from 60x300s subs. I am very keen to learn so any help or advice on how to process, capture etc would be welcomed. Edited March 18, 2021 by PeterBolt 3 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted March 18, 2021 Share Posted March 18, 2021 Background looks much cleaner with the extra data. One thing to watch out for though is clipping the black point. You can lose some of the finer detail in trying to make the background too dark. Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 18, 2021 Author Share Posted March 18, 2021 Ok thanks I will take another look at this 👍 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 18, 2021 Author Share Posted March 18, 2021 (edited) I think I have been having some issues with DSS. I noticed that 2 x Drizzle was ticked? and I was also having some issues with colour balance in post processing. I think these images look much better now? Can anyone point me in the direction of any reference material for DSS settings particularly for a modified DSLR? Edited March 19, 2021 by PeterBolt Quote Link to comment Share on other sites More sharing options...
peter shah Posted March 19, 2021 Share Posted March 19, 2021 lovey shot 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 19, 2021 Author Share Posted March 19, 2021 (edited) I did some more processing last night - mainly playing about with DSS setting. I think I now have an image I am happy with....well it looks OK on my laptop but not so good on my phone 🤔 Edited March 19, 2021 by PeterBolt Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted March 19, 2021 Share Posted March 19, 2021 21 minutes ago, PeterBolt said: I did some more processing last night - mainly playing about with DSS setting. I think I now have an image I am happy with....well it looks OK on my laptop but not so good on my phone 🤔 Looking good, the extra data certainly helped. Maybe it's my eyes, but your stars look triangular, suggesting pinched optics. Have you any thoughts on this? Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 19, 2021 Author Share Posted March 19, 2021 i have had the mirror out to clear - maybe i need to slacked off the clips a touch? Quote Link to comment Share on other sites More sharing options...
MarkAR Posted March 19, 2021 Share Posted March 19, 2021 20 hours ago, PeterBolt said: I noticed that 2 x Drizzle was ticked? Drizzle can be a benefit if you are under sampled but you must also be dithering 2x2 between exposures. Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 19, 2021 Author Share Posted March 19, 2021 (edited) I was using spiral dithering...with the aggressiveness set to 2 in BackyardEOS....would this be OK? I have reprocessed again selecting the best 90% in DSS which I think has improved the star shape - perhaps there were some subs where the guiding wasn't so good? I also stacked without any BIAS frames which seems to give better colours? Maybe I have an issue with my BIAS? Edited March 19, 2021 by PeterBolt 3 Quote Link to comment Share on other sites More sharing options...
Dmack1 Posted March 19, 2021 Share Posted March 19, 2021 These are really nice images - i think your last iteration is the best. well done. 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 19, 2021 Author Share Posted March 19, 2021 Thanks I got there in the end🤪 every day is a school day🙈 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 20, 2021 Author Share Posted March 20, 2021 (edited) On 3/19/2021 at 11:02 AM, AstronomyUkraine said: Looking good, the extra data certainly helped. Maybe it's my eyes, but your stars look triangular, suggesting pinched optics. Have you any thoughts on this? Do you think the star shape is any better in the latest images I posted below? If you still think think there are signs of pinched optics I will take out the mirror again and make a small adjustment. I will also double check that camera is square to the focuser. Thanks for your advice. Edited March 20, 2021 by PeterBolt Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted March 20, 2021 Share Posted March 20, 2021 25 minutes ago, PeterBolt said: Do you think the star shape is any better in the latest images I posted below? If you still think think there are signs of pinched optics I will take out the mirror again and make a small adjustment. I will also double check that camera is square to the focuser. Thanks for your advice. I don't see any images posted below. ☹ Pinched optics is usually connected to the primary mirror in a Newtonian. Maybe just needs a slight adjustment to make sure the retaining clips are not overtight. Brian Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 20, 2021 Author Share Posted March 20, 2021 (edited) . Edited March 20, 2021 by PeterBolt Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted March 20, 2021 Author Share Posted March 20, 2021 1 hour ago, AstronomyUkraine said: I don't see any images posted below. ☹ Pinched optics is usually connected to the primary mirror in a Newtonian. Maybe just needs a slight adjustment to make sure the retaining clips are not overtight. Brian Sorry I meant above in the previous post🙈 (yesterday at 12.33) I reprocessed using best 90% which I think improved the star shape. 1 Quote Link to comment Share on other sites More sharing options...
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