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.

Jannis

Horsehead and M42 in Ha at 50mm

Recommended Posts

After being sick for what feels like an eternity, followed by two weeks of clouds and wind, i simply could not just let this night go as it was said to be yet another week or two with clouds on the way.

With my main scope not quite ready for use yet, i quickly hooked up the QHY5L-II-M to a canon 50mm lens, attached a 7nm Ha filter, and started looking for a decent target. I didn't need to look long before i saw Orion, and then it was set! :)
As the moon is currently 78% lit i must admit i was a bit worried, but i think the end result turned out OK, especially considering the relatively little data of just about 1 hour.

Exposure is 13x 300s (and 35x 30s for the core of M42) with the QHY5L-II at gain 12.
The lens is a Canon 50mm F/1.4@F/2.8
Darks applied to 300s exposures, but no flats or offset. Stacked in DSS, processed in PS and cropped to 16*9 size.

 

M42 ha 13x300s and 35x30s g12 50mm f2.8.jpg

  • Like 12

Share this post


Link to post
Share on other sites

A classic composition.

Personally I'd prefer more noise and less NR in the processing but that's always a personal call.

Olly

Share this post


Link to post
Share on other sites

Thank you for the feedback Olly! :)

I have started to also prefer a bit of noise instead of washed out details. I compared the before and after, and i didn't see much lost details compared to before NR though, so maybe i did a mistake somewhere during processing. I will try a reprocess and see if i can make it better.
It might also be that 2x drizzle stacking with only 13 low res frames was a bit optimistic, so i will try again with no drizzle and see how it compares. I will also try to be more gentle with the NR next time. :)

Share this post


Link to post
Share on other sites

Oooooo..... I like this!! Are you planning on adding to it for the rest of the season?

Share this post


Link to post
Share on other sites

Thanks! :) 

I plan to add more data to it when able, but adding data to it for the rest of the season probably won't be an option. I'm also not sure how well it would work to add "moonless" data to an image like this where the moon was right over the target and lit up quite bright?

Share this post


Link to post
Share on other sites
53 minutes ago, Jannis said:

Thanks! :)

I plan to add more data to it when able, but adding data to it for the rest of the season probably won't be an option. I'm also not sure how well it would work to add "moonless" data to an image like this where the moon was right over the target and lit up quite bright?

No problem... just stack it all and that's that! You may find you get benefits from not using the data with the moon light, but that's a choice that can be made by stacking ALL data, then stacking the data without the moon in and seeing what's better :) 

  • 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 MarsG76
      The Orion Nebula imaged in RGB through a Celestron 8" SCT at F10 (2032mm FL) using a full spectrum modded and cooled Canon 40D. Tracked using a Celestron CGEM mount. Total exposure time was 1 hour and 24 minutes.
    • By MarsG76
      Hello All,
      I was wondering whether it's possible to image a DSO and capture any depth. Every 3D astro image online is faked so at the start of the year, I decided to image M42 six months apart.
      Back in March I posted a image of M42 imaged at f10, 2032mm FL through my 8SE on 28th February 2019. Than on 3rd September (setup and captured 15 second subs on 1 September) I captured M42 at the same focal length, same orientation and very similar subs for a total exposure of 1 hr 24 minutes. This was almost to the day exactly 6 months between the two images, so the earth was 300 million km away from the original position on the other side of the sun, furthest I could hope for imaging a 3D stereo pair.
      First attached is the image from September...

       
      I color matched the above image with the image from February, aligned them and below is the end result....

      As you can see there is no detectable 3D effect... There was a 3Dish effect but this was most likely due to the differences in processing of the two stacks and when I SCALE and rotate the two images to align them, and hence no 3D effect.
      Of course the stars and nebula are certainly not on a flat plain so I believe that the reason for the lack of any discernable depth is simply due to the distance of M42 resulting in  a very small angular shift in the stars, so small in fact, that it’s beyond the sensitivity of my 8” SCT, camera pixel resolution and tracking accuracy of the CGEM.
      Calculation of the expected motion of any parallax shift when the Orion Nebula is 1344 lightyears away and the distance of Earth being 149,600,000km from the Sun:
      1344LY = 1.2715e+16km
      Θ° = Tan-1(149.6e+6/1.2715e+16)
      Parallax Shift Θ” = 2 x 3600 x Θ
      Parallax Shift Θ” = 0.0048536712567150
      An angular motion of 0.005” was not picked up by my system that tracks with an average accuracy of about 1” RMS, with a camera sensor that has a resolution of 1.16”/pixel at 2032mm focal length with a 8” SCT. Even if I could get consistent tracking at the best accuracy that I have ever seen with my gear, 0.38” RMS, this is still well above 0.005” and well beyond the 40D sensor pixel resolution, and all this is without considering atmospheric distortion, obviously my setup is not even close to sensitive enough.
      This was a good project but unfortunately the distances of objects in the universe are too great, even objects classed as in our celestial “backyard”. If I didn’t try this experiment than I would be always wondering and curiosity would most likely make me try it eventually.
       
      Clear Skies,
      MG
       
       
       
    • By MarsG76
      This exposure of the Orion Nebula region is really just a quick and lazy session since I didn't want to waste a clear night by doing nothing and the scope was already setup and focused so I wouldn't be spending much time on setup. I also didn't have a plan for imaging another object it seemed like a good idea being a bright and easy object to image.
      I already imaged this object in the past, but by comparing the setup, procedure and improved tracking accuracy of the past together with the now cooled 40D, I know that the result would have been an improvement if I would have dedicated the necessary exposure time, through the necessary NB filters.
      This image all consists of RGB/OSC, IRCut filtered, 31x15s, 32x30s, 16x60s, 10x90s, 11x120s ISO1600 subs. 
    • By rotatux
      My first relative success at this target.
      Some dust mites show because the mount had good tracking and I used no darks nor flats. With my camera the cure should be quite simply to power cycle off/on so that auto-cleaning moves the dust elsewhere.
      Capture: Olympus E-PL6 on Skywatcher 130PDS at 565mm/4.35 with SWCC and didymium filter on Omegon EQ-300 tracking RA
      Exposure: 12 × 60s × 2500iso
      Site: 50km from Paris (France), sky Bortle ~ 4
      Processing: Regim 3.4, Fotoxx 12.01+
×
×
  • Create New...

Important Information

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