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_through_the-_eyepiece.thumb.jpg.cb85f690376dcb3053c747827de6bf9e.jpg

Recommended Posts

My first attempt at NGC281 was with my ED 80 and taken with my colour camera - and I definitely thought the result looked liked the Pacman.

So, whilst attempting to image this object with my Esprit 150, I thought I'd end up with another Pacman, albeit somewhat more detailed. However, the more I looked at my narrowband result, the less I decided it looked like the video game character. I think this is because my eye was drawn to the various nebula details, which tend to be absent in a broadband approach but reveal themselves with a narrow-band technique. So, for this bi-colour image, I decided to try to enhance the details by experimenting with colour contrast curves and the Pixinsight script DarkStructureEnhance.  The image represents 9 hours total integration time. 

(If you are still interested in seeing the Pacman, then you need to rotate the image by 180 degrees).

5a82d38c45518_30.Final.thumb.jpg.955f823ee847a7349536d2bcbae16fbb.jpg

 

Alan

LIGHTS: Ha:8, OIII:10 x 1800s, DARKS:30, FLATS:40, BIAS:100 all at -20C.

  • Like 10

Share this post


Link to post
Share on other sites

Nice, I like the faint nebulosity around the edge of the nebula proper. There's a nice 35 effect in the centre as well.

Cheers, Ian

Share this post


Link to post
Share on other sites
7 hours ago, iansmith said:

Nice, I like the faint nebulosity around the edge of the nebula proper. There's a nice 35 effect in the centre as well.

Cheers, Ian

Thanks for the comment Ian.

Ideally, I'd like to have captured a little more faint nebulosity but this target has now disappeared below my local horizon, I guess that is a downside of attempting to image 7 targets simultaneously.

I see what you mean about the 3D effect, I hadn't noticed it until now.

Alan 

  • Like 1

Share this post


Link to post
Share on other sites
10 hours ago, astro mick said:

Very nice indeed.

Well done.

Mick.

Thanks for the comment Mick. :happy11:

Alan

Edited by alan4908

Share this post


Link to post
Share on other sites

That’s spectacular. I love the colour graduation and how it emphasises the fainter detail within the centre.

Share this post


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

That’s spectacular. I love the colour graduation and how it emphasises the fainter detail within the centre.

Thanks Ken - yes, I was using contrast curves in the central region separately for the RGB channels in order to maximize the details and also (hopefully) end up with a colour that I liked.

Alan

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By alan4908
      This is a narrow band image with Red mapped to Ha and Blue mapped to OIII.  After balancing the Ha and OIII data in Pixinsight via Linear Fit, I generated a synthetic green in PS via Carboni's actions.  It represents 15 hours integration time and was taken with my Esprit 150.  
    • By alan4908
      I've always found the Pacman nebula (NGC281) very difficult to process in RGB since I always tend to end up with a low contrast image that is largely devoid of detail.  So, since I prefer realistic looking colours, I decided to try out a narrow band approach with Red mapped to Ha and Blue mapped to OIII.  After balancing the Ha and OIII data in Pixinsight via Linear Fit, I generated a synthetic green in PS via Carboni's actions.  The result below represents 15 hours integration time and was taken with my Esprit 150.  To illustrate the amount of detail revealed, I've also included a small crop of the central region.
      Alan

      NGC281

      NGC281 (crop)

       
      LIGHTS: 9 Ha, 21 OIII x 1800s, DARKS:30, BIAS:1000, FLATS:40 all at -20C. 
    • By glowingturnip
      Wakka wakka wakka...

       

      22x 600s Ha, 11x 420s L, 10x 300s R, G and B, darks flats and bias, equipment as per sig, pixinsight.
       
      If I'm honest, I wasn't really feeling the love for this one very much and it's been languishing on my processing shelf for a while - a little too much of it being an amorphous pink blob, coupled with oddly triangular stars (I had issues with coma and collimation when I took it, now resolved, but it meant I was getting tri-lobed guide stars in my OAG and I think that fed through from the guiding to giving me triangular stars in the images.  You can't really see them since Flickr doesn't zoom in enough).  Still, it turned out alright, and I quite like the detail version.
       
      The Pacman Nebula (NGC 281) is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way's Perseus Spiral Arm.  The nebulosity is associated with an open star cluster, several Bok globules and a bright quintuple star system.  It lies approximately 9200 light years away.
       
      Pac-Man was designed to have no ending – as long as at least one life was left, the game should be able to go on indefinitely. However, a bug keeps this from happening - an 8-bit arithmetic overflow error on level 256 would mean that the game would try to draw 256 fruits on the screen rather than the maximum of 8 that it would normally draw.  This corrupts the bottom of the screen and the entire right half of the maze with seemingly random symbols and tiles, overwriting the values of edible dots which makes it impossible to eat enough dots to beat the level. Because this effectively ends the game, this "split-screen" level is often referred to as the "kill screen".  A perfect Pac-Man game occurs when the player achieves the maximum possible score on the first 255 levels (by eating every possible dot, power pellet, fruit, and enemy) without losing a single life, and using all extra lives to score as many points as possible on Level 256.

       
      This was actually my second attempt at this target - this was my first one, with a modded DSLR - actually not too bad:

       
      Hope you enjoy !  Comments and cc welcome.
       
      Stuart
    • By CKemu
      NGC281 - The Pac-Man by Chris Kennedy, on Flickr
      35kph gusts of wind, and REALLY bad guiding due to a lack of drift align and the star being "blown away", but managed to get a little something out of 30x360s light frames, also a new target for me, one I want to come back to under better conditions and with other wavelengths of light to make a full colour image.
    • By gorann
      While I am waiting for enough astrodark to make it worth while up here, I have revisited my Pacman nebula data from November last year, since I had the feeling that there were more nebulosity there to bring out. Most Pacmans I have seen posted on the web are processed quite hard and only bring out the central parts - maybe to emphasize the Pacman figure. However, I just saw a Ha image of Pacman at Astrobin that reveals a lot of surrounding Ha-nebulosity, particularly to the right of the nebula (http://www.astrobin.com/full/144610/0/).
      So here is my revised version showing more of that surrounding nebulosity. Below it I post my old version for comparison.
      Processed in PS CS5 now also using the APF-R technique (http://www.cedic.at/apfr/) to bring out more faint stuff and a round of Hi-pass filtering to bring out more structure in the nebulosity.
      Equipment: ES 127EDapo with a Canon 60Da on an EQ8
      29 x 360 sec, so totally about 3 hours.
      Any comments and suggestions most welcome - I am sure it can be improved


×

Important Information

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