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WIP - NGC 2903


PeterBolt

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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 🤞

 

NGC_2903_PB_1.jpg

Edited by PeterBolt
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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.

NGC_2903_5hrs_Crop_Final1.jpg

 

NGC_2903_5hrs_Final.jpg

Edited by PeterBolt
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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 by PeterBolt
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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 by PeterBolt
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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 🤔

NGC_2903_DSS_Crop.jpg

 

NGC_2903_DSS_1.jpg

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?

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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?

 

NGC 1903 Final Crop.jpg

 

NGC 1903 Final.jpg

Edited by PeterBolt
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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.

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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

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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.

 

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