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First Picture, Veil Nebula at 938mm QHY600M

DSO Astrophotography
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#1 danoon

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Posted 14 September 2021 - 07:15 PM

I've been photographing this nebula for a couple of months trying to work the kinks out of my system from my Bortle 5 backyard.  Previously I was using a DSLR on a tripod, so this is a big step up to go to a 140mm APO at 938mm@f6.7 with the QHY600M.  I feel like I need to experiment with a couple more millimeters of back space, but it is definitely getting close.  I have to say when I started this I didn't realize how much of a learning curve it would be to process the pictures.

 

For this picture I used APP, with some star reduction using Photoshop.

 

Details

72x Luminance @120s

24x each Red/Blue/Green @120s

 

 

Phd2 RMS range was .5 to 1.5.  I'm still trying to figure out what affects this, I think my polar alignment is a bit off and the larger spike might be wind.

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  • NGC 6992.jpg

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#2 RogeZ

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Posted 14 September 2021 - 07:26 PM

You seem to have lost a lot of FOV, what happened?



#3 danoon

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Posted 14 September 2021 - 07:34 PM

You seem to have lost a lot of FOV, what happened?

Do you mean the cropping?  Yeah, I cropped it because it made it easier to see some of the detail.  This is what it looked like before some star reduction and uncropped

Attached Thumbnails

  • NGC 6992full.jpg

Edited by danoon, 14 September 2021 - 07:34 PM.

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#4 RogeZ

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Posted 14 September 2021 - 09:25 PM

Yes I meant cropping. Obviously a personal choice but keep your FOV, there are a lot of beautiful stars out there :)
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#5 imtl

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Posted 15 September 2021 - 12:16 AM

+1 on keeping the FOV. For tiny details you can just zoom in :)


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#6 F.Meiresonne

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Posted 15 September 2021 - 01:18 AM

Do you mean the cropping?  Yeah, I cropped it because it made it easier to see some of the detail.  This is what it looked like before some star reduction and uncropped

Quite surprised you get this FOV in an 140 mm F/6.7. 

 

It is wider then my 102 mm at F/7



#7 danoon

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Posted 15 September 2021 - 10:51 AM

Quite surprised you get this FOV in an 140 mm F/6.7. 

 

It is wider then my 102 mm at F/7

Maybe it's the full frame camera?  I'm not sure, but it matches up pretty closely with Nina framing.  Though when I look at it more it does seem to be slightly wider.

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  • nina ngc 6992.jpg

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#8 matt_astro_tx

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Posted 15 September 2021 - 02:25 PM

That wider FOV is beautiful.  Like it's just floating through space.  (Which it is...)


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#9 F.Meiresonne

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Posted 15 September 2021 - 03:42 PM

Maybe it's the full frame camera?  I'm not sure, but it matches up pretty closely with Nina framing.  Though when I look at it more it does seem to be slightly wider.

Oeps,  yes off course, i missed that...



#10 BinoGuy

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Posted 15 September 2021 - 05:09 PM

I like the zoom.  My parents and older friends don't zoom, as a habit, and I think they forget it's a thing.   danoon, I really like the colors you decided to highlight.  I took the same photo two weeks ago and it came out with more oranges and greens, I like yours better.

 

 

Cheers and clear skies!  BinoGuy   °¿°


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#11 f430

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Posted 15 September 2021 - 06:16 PM

You have a good start, and a couple more hours would help bring out the details more.

Do you have narrow band filters?

This target comes out really well in narrow band. Either HOO or SHO, depending on the colors you like.

Keep at it, keep learning!


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#12 danoon

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Posted 15 September 2021 - 10:47 PM

You have a good start, and a couple more hours would help bring out the details more.

Do you have narrow band filters?

This target comes out really well in narrow band. Either HOO or SHO, depending on the colors you like.

Keep at it, keep learning!

I have Ha filter, but not the others.  I might try seeing what that adds.  I added another night of LRGB.  I'm pretty happy with the details I can see in the nebula but I'm still struggling with star reduction.  After stretching in APP, the nebula is very hard to see because of how many and how bright all the stars are.  Here is another attempt at star removal with photoshop.

Attached Thumbnails

  • ngc6992a.jpg

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#13 danoon

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Posted 15 September 2021 - 10:49 PM

Here is what I started with after stretching.

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  • ngc6992-stars.jpg


#14 danoon

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Posted Yesterday, 10:17 PM

One last edit.  I used starnet to create a star mask, then used that star mask in photoshop to select the stars from the stacked image with, +1 expand and +1 feather to the selection, then minimized the selection. 

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  • stretched-Edit-1.jpg

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#15 matt_astro_tx

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Posted Today, 02:05 PM

I have Ha filter, but not the others.  I might try seeing what that adds.  I added another night of LRGB.  I'm pretty happy with the details I can see in the nebula but I'm still struggling with star reduction.  After stretching in APP, the nebula is very hard to see because of how many and how bright all the stars are.  Here is another attempt at star removal with photoshop.

I like this edit (post #12) the best!  Nice work!




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