Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_solar_25.thumb.jpg.f1d5d01d306644f613efd90ef96b314c.jpg

Xiga

M81 & M82 Re-Reprocess! 80ED & D5300

Recommended Posts

Posted (edited)

Hey guys

So with no new data at hand (or on the horizon it would seem) i decided to go back and re-process my short stack of M81 & M82, being the glutton for punishment that i am! The last time i re-processed this was about a year ago, so i was curious to see if i could get any more out of it. 

It's hideously low on data (nothing new there!), this is just 9 x 600s of colour (with an IDAS-D1) together with 7 x 1200s of Ha (which i only used to Lighten the Reds in the Ha jets of M82 and the small spiral regions of M81). AstroPixelProcessor used for stacking and gradient reduction, and PS for everything else. 

I mistakenly shot the colour at ISO 800, instead of the usual 200 i always use. A mistake i imagine every DSLR user has made before! And i have to say i really noticed it during processing. There was noticeably less colour in the stars. 

That being said, i was still able to bring out more colour in the core of M81 this time. And i think M82 looks a bit better as well, it was definitely over-sharpened before. 

I really love these targets, but they just make me wish i had more reach! 

CS!

Here is the original thread:

 

And here's the new one, including a cropped version:

1407466304_M81M82v6.thumb.jpg.bd3b1f988e5f5347c7555d4efe6ac6ec.jpg

1173282805_M81M82v6Crop.thumb.jpg.47aab8f6399b77a02d097aaec99d9a08.jpg

Edited by Xiga
  • Like 19

Share this post


Link to post
Share on other sites

Mate your work is truly amazing. Really love what you were able to do with the data you had. Top work mate. 

Share this post


Link to post
Share on other sites

A skilful hand Ciaran. Very very nice. 

Share this post


Link to post
Share on other sites

I really like this.  M81 my favourite object and your rendition is wonderful.  I am working on this too and have a ton of data to process.  If I can come anywhere near your standard I will be well pleased.

Share this post


Link to post
Share on other sites

Cracking image.......could you tell me what did you use for processing.

Share this post


Link to post
Share on other sites
2 hours ago, souls33k3r said:

Mate your work is truly amazing. Really love what you were able to do with the data you had. Top work mate. 

Thanks mate. The small amount of data went further than I thought it could tbh. 

2 hours ago, tooth_dr said:

A skilful hand Ciaran. Very very nice. 

Thanks Adam! ?

1 hour ago, kirkster501 said:

I really like this.  M81 my favourite object and your rendition is wonderful.  I am working on this too and have a ton of data to process.  If I can come anywhere near your standard I will be well pleased.

Cheers Kirk! I also love these targets so I look forward to seeing your version 

  • Like 1

Share this post


Link to post
Share on other sites
1 hour ago, paul mc c said:

Cracking image.......could you tell me what did you use for processing.

Thanks Paul! I've amended the OP now, but I used AstroPixelProcessor for stacking and gradient reduction, and PS for everything else. 

I started out doing Narrowband, then only later did I start to do a few true colour images, so natural colour processing is something I've had to gradually get better at over time. I now know that until APP adds colour-preserving stretching (due soon I believe) then it's not sufficient to simply start from a DDP stretched image. Most of the colour has been washed out by that stage. So what i do at the moment is work on 2 separate stacks. One, I stretch manually in PS using sharkmelley's excellent arcsinh colour stretching method. I use this one for colour only. I can then add in a DDP stretched image (or my own stretched one) for Luminosity. This gives the best of both worlds, but the key is to get the background to roughly the same level beforehand. 

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Xiga
      Back in early Feb I tried imaging Markarian's Chain, but after 2 subs I encountered guiding issues (a first for me) so had to give up. 
      So just for kicks and giggles, I decided to process them! ? 
      So this is 2 x 10mins. With the D5300, 80ED and HEQ5-Pro. 'Stacked' (if it's even right to use that term!) in APP, and processed in PS. Then reduced to 75% for posting. 
      Why oh why oh why..... I honestly don't even know myself ?

    • By Xiga
      Hi guys
      I'm breaking the cardinal rule here of posting late at night, right after finishing PP, so let's see what sense the dawn brings! ? 
      I shot this in the early hrs of 29th of March. There was no moon present (i think!) and conditions were pretty good, AFAIK. 
      This is 28 x 360s, so about 2.75 hrs in total. Taken as usual with the D5300, IDAS-D1, and SW 80ED. 
      APP used for stacking and gradient reduction, everything else done in PS. 
      Would have liked twice, or 3 times, the data, but it's just not happening, so i've just decided to process what i've got. 
      Thanks for looking, and all CC welcome as always ?

    • By Galaxyfaraway
      This is maybe my 3rd attempt at a galaxy and I am trying to figure out the best way of doing it since I live in a red zone of London suburbs.
      I took this over 2 nights (well, 1.5 really, as my guiding wasn't working and plate solver wouldn't comply after meridian flip...) with my 8" EdgeHD SCT with 0.7x reducer and Atik 490X. Around 20 Luminance subs at 10 mins each  (1x1) and around 15 RGB subs at 5 mins each, but binned 2x2. I use Astrodon filters but also have an LP filter permanently in my image train. 
      Question: should I only use RGB and create a synthetic L channel, given LP, or continue trying with the actual luminance? Gradients are horrible with luminance but RGB doesn't have as much detail (only red filter seems to be more sensitive).
      My stars are all over the place (colours pop out everywhere, in the wrong way), how can I control this better?
      Also, as I wrote, the red filter seems to have much more detail than the rest and when I add all the channels into PS, the red colour just overpowers everything (and in general, how can I keep the star colours as they are and not have the red and blue go crazy - I am not sure the name for it, but it looks like chromatic aberration on steroids).
      Any other general tips would be great...
      Thank in advance. GFA
      PS: I cheated with the core: just changed the temperature to make it look a bit more glowy; for some reason, I barely had any yellow colour from the data...I will post stacked images, if of interest.
       
       
    • By Xiga
      Like the lunatic that I am, I decided to get the scope out last week during that storm that was passing through. The skies were clear and there was no moon about, so I figured why not! Only problem was the 17-20 mph winds, lol.
      I got 2 hrs of subs but had to throw away half of them due to guiding problems more so than the wind, amazingly. This was the 2nd time in a row i'd had Dec guiding problems, and that's after about 2 years of not having a single problem guiding. After the 1st hr of wasted subs, I turned off Fast Switching in Dec and chose to only Dither in RA, and the Dec problems mostly went away, at least to allow me to capture 1 hr of 'still dodgy but just about useable' subs. Once M42 disappeared behind the neighbour's roof, I then re-calibrated on the Celestial Equator (Dec 0) and when I switched to the Pinwheel Galaxy I was able to guide as normal again (with Fast Switching and Dithering in both RA and Dec both turned on again) and didn't lose any subs, despite the wind, so I've decided that from now on I won't be calibrating at the target itself, i'm always going to do it at Dec 0.
      I decided to throw this in with another 1 hr of subs (plus 10 x 30s for the core) that I took back in Jan 2017 (has it really been that long?!). That hr also had issues, with some weird streaking in the lower left that I could never work out what caused it. The D5300 hadn't been modified at that stage either. So I fired it all in to APP and decided to stack it anyway, and give it a quick process. Then chose to crank it up to 11 on the colour front, just for laughs.
      It won't be going on the wall anytime soon, lol, but I suppose it came out a bit better than I was expecting, all things considered.
      20 x 360s with an IDAS-D1
      D5300, 80ED, HEQ5-Pro.
      Stacked in APP, processed in PS.
      CS!
      edit - I forgot to downscale it - so no pixel peeping allowed ?

    • By Xiga
      Between the clouds, moon, neighbour's roof, nearby floodlights, and all the usual general life stuff, i've simply not been able to get any meaningful data on the HH (or Orion for that matter either) for the last 2 years! To say it's been my nemesis would be an understatement. At this rate i'll be glad to have that box ticked proper before i hit 50 ? 
      So when we had a few hrs of clear sky (and no moon) a couple of weeks back i knew i had to give it a go. I luckily managed 9 x 7mins before it disappeared behind the neighbour's roof. I also have 5 subs of Ha (90 mins in total) from last March, although it wasn't of great quality (there was a nearly full moon right beside it, plus the neighbour's fire smoke was billowing up through the Fov ? ). 
      I've been waiting patiently for more clear skies to add to this, but that 's not working out too well, lol. I really shouldn't be processing this, but all work and no imaging makes Ciaran a dull boy, so here goes nothin...
      9 x 7mins with an IDAS-D1
      4 x 1200s and 1 x 900s of Ha
      ~2.7 hrs in Total
      Stacked in APP and processed in PS. Lots of heavy lifting needed in PS, and i've reduced it to 50% in size as well. 
      For now, at least, this will have to do. There's a lot of good HH's about so hopefully this one's not too hideous! ? 
      I'll post what the 2 raw stacks looked like below as well, just for kicks. 

       
      Here's the 9 x 7 mins raw stack (with DDP stretch):

      And here's the ~90min Ha raw stack:

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.