Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Andromeda

  • Please log in to reply
15 replies to this topic

#1 Melgabean

Melgabean

    Vostok 1

  • -----
  • topic starter
  • Posts: 126
  • Joined: 15 Jan 2018
  • Loc: Colorado

Posted 07 December 2018 - 12:17 AM

here is my attempt at Andromeda. Its not bad i'm just not very good at Pixinsight yet. So many features and I have no idea what most of them do.

 

Scope - WO GT71

Camera - Sony A7ii

Mount - Orion Atlas (unguided)

light pollution - big city red zone

subs - 160x45sec @ iso 800

Stacked w/ DSS

Processed w/ Pixinsight

Images shrunk to fit forum rules

 

comments/suggestions are very welcome.

 

Andromeda002.jpg


  • GilATM, Jim Waters, mikewayne3 and 11 others like this

#2 petert913

petert913

    Vanguard

  • *****
  • Posts: 2295
  • Joined: 27 May 2013
  • Loc: Portland, OR

Posted 07 December 2018 - 12:22 AM

I think it looks very good. Nice guiding and the color is very natural. 



#3 Melgabean

Melgabean

    Vostok 1

  • -----
  • topic starter
  • Posts: 126
  • Joined: 15 Jan 2018
  • Loc: Colorado

Posted 07 December 2018 - 12:29 AM

Thanks! if anyone knows any really good tutorials for PixInsight please point me in that direction. For being in the middle of a city I really can't complain. its about a 2 hour drive for me to get to a dark site and every time I think i'm going to have a chance to go the wife ruins it.



#4 Jim Waters

Jim Waters

    Surveyor 1

  • *****
  • Posts: 1757
  • Joined: 21 Oct 2007
  • Loc: Phoenix, AZ USA

Posted 07 December 2018 - 12:43 AM

This a real nice image.  Great processing.  Why did you do the initial processing with DSS?

 

https://www.youtube....h?v=-aESzI1E0JE



#5 Melgabean

Melgabean

    Vostok 1

  • -----
  • topic starter
  • Posts: 126
  • Joined: 15 Jan 2018
  • Loc: Colorado

Posted 07 December 2018 - 12:56 AM

This a real nice image.  Great processing.  Why did you do the initial processing with DSS?

 

https://www.youtube....h?v=-aESzI1E0JE

Cause I didn't understand how to stack them in PixInsight. and I liked the DSS stack better than the Batch-Preprocessing. That seems like a pretty thorough tutorial though so I will follow that in the next couple days and see if I can get anything better.



#6 GilATM

GilATM

    Messenger

  • *****
  • Posts: 412
  • Joined: 04 Aug 2007
  • Loc: Ventura, CA

Posted 07 December 2018 - 06:14 PM

I like it! I am surprised the field of view is so wide with that scope. Must be the full frame camera. On the subject of the camera, I'm glad to see Sony didn't devour too many stars!

#7 925chicago

925chicago

    Sputnik

  • *****
  • Posts: 27
  • Joined: 09 Aug 2018
  • Loc: Mokena, IL

Posted 07 December 2018 - 08:07 PM

Your image is fantastic - nice job! I too am just getting started with astrophotography and downloaded the trial for PixInsight. I just took a run at M31 as well and tried to use PixInsight but as you can tell with the image I'm struggling a bit. I'm going to try a mosaic at some point but I'm working on this for now.

 

I'm half way through the Bracken primer (suggested reading by the way - its great) so I know what I'll be doing for the next few months thinking1.gif

 

Seems like a long journey ahead but hopefully it's worth it! Good luck!

Attached Thumbnails

  • M31_small.png

Edited by 925chicago, 07 December 2018 - 08:08 PM.

  • mikewayne3 likes this

#8 the Elf

the Elf

    Apollo

  • -----
  • Posts: 1054
  • Joined: 06 Sep 2017
  • Loc: Germany

Posted 08 December 2018 - 11:52 AM

That is a good image! Your PI skills are better than you think. If you like epic tutorials, visit my YouTube channel, maybe you pick up something there. If you perfer printed matter I recommend Warren Kellers Book "Inside PixInsight", meanwhile 2nd edition is out but 1st is also fine if you are just beginning.



#9 Melgabean

Melgabean

    Vostok 1

  • -----
  • topic starter
  • Posts: 126
  • Joined: 15 Jan 2018
  • Loc: Colorado

Posted 08 December 2018 - 03:25 PM

Thanks elf I shall check your YouTube out.

#10 Craig H

Craig H

    Ranger 4

  • -----
  • Posts: 323
  • Joined: 08 Apr 2009
  • Loc: Portland, OR

Posted 09 December 2018 - 07:41 PM

I agree, nice shot!  I like the wide angle, did you have have to deal with any vignetting with that scope/camera combo?

 

Craig.



#11 Melgabean

Melgabean

    Vostok 1

  • -----
  • topic starter
  • Posts: 126
  • Joined: 15 Jan 2018
  • Loc: Colorado

Posted 10 December 2018 - 01:06 PM

I agree, nice shot!  I like the wide angle, did you have have to deal with any vignetting with that scope/camera combo?

 

Craig.

 

there was a very tiny amount in the corners.



#12 antilles72

antilles72

    Surveyor 1

  • -----
  • Posts: 1723
  • Joined: 06 Mar 2007
  • Loc: Rhode Island

Posted 10 December 2018 - 01:48 PM

Great job!



#13 fewayne

fewayne

    Ranger 4

  • *****
  • Posts: 312
  • Joined: 10 Sep 2017
  • Loc: Madison, WI, USA

Posted 10 December 2018 - 03:25 PM

What the Elf-man says: Nicer than you apparently thought it was! Good job. Some great detail in the dust lanes.

 

There do appear to be some elongated stars along the right edge of the image -- do your individual sub-exposures show that? I'm also interested to know if you can yank more of the galaxy's ellipsoid out of your data. M31 does have a right edge, honest!  >;-}



#14 Melgabean

Melgabean

    Vostok 1

  • -----
  • topic starter
  • Posts: 126
  • Joined: 15 Jan 2018
  • Loc: Colorado

Posted 10 December 2018 - 04:09 PM

The subs do have the elongated stars on the right edge. This is the first images I have taken with this new scope and I probably don't have the field flattener perfect yet. And I also need to tighten up the crayford focuser as there is some tilt with all the gear.

As far as pulling out more data probably not. It is very very light polluted where I'm at (middle of a big city). You can basically make out the main stars in constellations and that's all.

I appreciate the positive feedback on this image. I agree it looks very nice and eventually I'll try Andromeda at a dark site.

#15 Keudn

Keudn

    Explorer 1

  • -----
  • Posts: 79
  • Joined: 21 Feb 2017

Posted 10 December 2018 - 10:58 PM

Thats a nice even dark background. After you removed the background gradient, did you have a fairly noise free background? Or did you have to remove background noise in processing? I always end up with a lot of colored noise in my backgrounds and its a real challenge to remove it



#16 Melgabean

Melgabean

    Vostok 1

  • -----
  • topic starter
  • Posts: 126
  • Joined: 15 Jan 2018
  • Loc: Colorado

Posted 10 December 2018 - 11:12 PM

There was quite a bit of noise. After stretching I extracted a luminence frame and used curves transformation to darken it. Then Applied that as a mask to the image and inverted it so the stars and galaxy were protected. Then I use MultiscaleLinearTransform for noise reduction. I adjust just luminence as the target first then up the amount of layers and do chrominance as the target. Seems to work fairly well for me and not too hard.


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics