Jump to content


An old M27 with some new data added

Recommended Posts

Back in 2013 i captured a nice image of this nebula that i was very pleased with. However, it strongly lacked red as my unmodded 550D filtered it all out. 

So here the other day, trough some fog, i managed to capture some Ha data with the help of the QHY5L-II-M and a Baader 7nm Ha filter with the explorer 200. 
Exposures were limited to only 60 sec as i was capturing unguided, and even then i had to throw away half my subs (i really need to have my mount chacked and serviced...). 
Captured using Firecapture, with gain set at 1000, and peltier cooled the camera to about -20c. 

RGB data from 2013: 1 hour 45 min @ ISO800.
Ha data from this week: 47x 60 sec. Gain 1000.

I think the Ha data helped a lot to bring out more red color and details. What do you guys think?

Original RGB from 2013:

Ha data from the QHY5L-II-M:
M27 47x 60s Ha.jpg

New HaRGB:

  • Like 7
Link to post
Share on other sites

The HA makes the edges of M27 Burn- very nice. How did you add the HA?- let me know I'm always looking to compare notes. I use PixInsight Pixel math to merge the HA directly into the red channel but I know there are other ways.

Link to post
Share on other sites

Thanks. :)

I only use Photoshop to process my pictures. To blend in the Ha data, i first extract the red channel from the RGB and open it as a new picture. I then add the Ha as a new layer. After roughly adjusting the levels and curves, i duplicate the Ha layer, run a light (usually 2-10) high-pass filter on it, set it to overlay and merge it down to have a Ha layer with some increased sharpness and details. I then duplicate it again, and used a mix of lighten and screen (with layer masks applied to not burn out the core) when merging it with the R-channel. 

After this i simply copy the new HaR-channel and paste it back into the R-channel of the RGB picture. 

There might be many other ways to do it, and i have no idea is this is a good or bad way to do it, but it seems to have improved my picture significantly at least. :)

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 Xiga
      Hi guys
      So we had a completely clear night last Thursday and, as luck would have it, i was actually off work all week, so i was able to take full advantage. Well, mostly, as you'll soon find out. 
      As it turned out this was a night that almost went completely awry. The first thing that i messed up was i forgot the external battery that keeps the D5300 powered all night. I only noticed this after driving the 45 min trip back to the family home where i do my imaging. Doh! Luckily though, i dipped into my big bag of astro stuff and found the 2 old camera batteries and charger that i used to use. By my reckoning it was last December when i last used them, so i was amazed to find they still had quite a bit of charge in them! So i was able to charge one while i used the other. Unfortunately though it meant i had to keep going out to the scope every 2-3 hrs to change battery, but tbh i was just relieved that i didn't have to drive home and lose another 90 mins of dark sky time. 
      The next thing to grumble was the guider. For some bizarre reason, i could not see Polaris in the Fov in Sharpcap. I could barely see anything at all tbh so even though Sharpcap told me it was able to platesolve i was very dubious. And then when i came to do the Sharpcap PA routine, the adjustments were jumping around all over the place. It took me about 25 mins to PA instead of the usual 5, and i really thought the guiding was going to be a nightmare, but what do you know, it turned out to be actually really good. It even dipped below 0.5" at times. Go figure!
      Due to the floodlights of the sports facility (which is rather conveniently only about 100 yards away from the house) i was forced to start with Ha subs, then once they were turned off at 10pm, i switched to Oiii, as i knew the moon was coming up around 00:30 so i needed to take advantage of the darkest part of the night. I figured i'd go for about 3 hrs of Oiii, knowing that with the final filter change back to Ha again, i should end up with about 4-5 hrs of Ha in total. Well, after doing the last filter change and going back in to grab a nap for a couple of hrs, when i woke up and checked Team Viewer i noticed that the sequence had unexpectedly ended. Went out and saw that the 7 Ahr LifePo4 battery i use for the mount had died. I also noticed that the lens of the Finder-Guider had completely dewed up. As it turned out, the dew strip for it had failed so i've had to order a new one. I've also ordered a PSU to power the HEQ5-Pro from the mains, so fingers crossed i shouldn't have to worry about mount power over the winter now. All in all this was a bit of a pain of a night, as i normally only shoot 1 filter per night. Sometimes in the longer winter nights i might do 2, but i've never done 3 before. It's a real hassle too, as i need to shoot flats, change filter, re-frame and re-focus. All of which can take upwards of 30 mins. Hmmphh. 
      So long story short i didn't end up with as much Ha as i wanted for this, which has meant it's been trickier to process than i would have liked. I should probably have just waited and done another night of Ha, but with all the hassle i have to go through to get any imaging done these days (drive, setup, tear down and pack away, drive home, sleep deprivation) i will always just try and use what i've got and move on to the next target. The Mean ADU level was quite low on this one, probably because the target is quite small and only occupies the centre of the frame. I've probably been lucky up to now, by mostly shooting larger targets, so i was disappointed with the low ADU levels, which are scraping the bottom of the barrel for me in terms of getting away from the noise floor. So i upped my exposures a bit, pushing as high as 25 mins, which is the nighest i've ever gone with the HEQ5-Pro. It seemed to still handle it quite well, although it didn't improve the Mean ADU level anywhere near enough. 
      Full capture details:
      3 x 1200s, 2 x 1380s, and 4 x 1500s of Ha
      9 x 1200s of Oiii. 
      11 x 480s of RGB (with an IDAS-D1). Used for the stars and sky background only. 
      7 Hrs 54 Mins in Total. 
      All shot with a Nikon D5300, SW 80ED, and an HEQ5-Pro. 
      The RGB data was shot over a year ago from inner city Belfast (Red Zone) while i was testing out the new Rowan belt mod. It was just a test shot to check the guiding, so the 8 min subs were far, far too long in reality, hence a lot of the medium and bright stars are clipped. But i have to say, the IDAS-D1 together with APP did a nice job of cleaning it right up and making it at least useable (well, by my standards at least!). 
      So on to processing. I've been playing with this for several nights now, and i just can't look at it anymore! i think this is the best i can manage with the limited data i have. It's been enjoyable and yet frustrating at the same time, lol. As usual, this has been stacked in APP and processed in PS. I used the tone-mapping method of processing, and created a synthesised Sii from a 50/50 blend of the Ha and Oiii. I then combined them in the classic Hubble Palette SHO. Obviously, not having any real Sii means i can never get the full range of tonal variations throughout. I'm also not completely happy with the colours if i'm being honest (especially the blue). That was the part i struggled with the most on this one. 
      I've also attached below a quick and dirty HaRGB version, which took me all of about 30 mins to process (in total contrast to the SHO version, which i won't say how long it took!). 
      As always, constructive criticism welcomed with open arms! 
      Ok time for me to stop rambling on now ? 
      Edit - Forgot to say, I resized the sSHO version down to 75% of the original (it's not worthy of 100% viewing).

    • By AstroAndy
      Hi all
      This one was processed using Ha as monochrome Luminance layer.
      Ha 2x15m 2x10m 31x5m, binx1, 3h25m integration time
      RGB 5x5m each, bin1, 1h15m integration time, altogether 4h40m.

    • By AstroAndy
      Hi all
      Another M27, this time with H-alpha added: I set out to capture the outer shell, no matter how little or much. It may not be perfect, but I'm happy with it. 2x15min, 2x10min, 31x5min, RGB 5x5 in each channel, bin x1, altogether 4:40h of exposure. This is an HaRGB image, Ha integrated into red, and the separate HaR used as luminance.

    • By codeman
      I was very excited to process those photos of the NGC6188 region. After many hours of work I was not happy with the result and started from scratch, finally I got the result I was pleased with.
      Photo Details:
      Ha: 1.1 Hour
      RGB: 20 Min each channel
       Total Exposure: 2:10 Hours
      Telescope: ASA 12'' F3.6
      Mount ASA DDM85
      Camera: FLI 8300 Mono
      Location: Namibia

      Hope you like it too

      Thanks for watching
      Haim Huli
      To all my photos, follow me at my Flickr page: https://www.flickr.com/photos/101543943@N04/
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.