Lagoon Trifid HaRGB revision

vlazg (George) · #1 01-09-2019, 10:46 AM

Competing with the smoke haze up here is a pain in the .........
FSQ 106 EDX3
Moravian G31620
AZEQ6
Taken over 2 nights , about 8 hours
Comments and criticisms welcome
Better resolution here https://www.astrobin.com/p6buym/0/
George

The_bluester (Paul) · #2 01-09-2019, 08:45 PM

Looks quite a nice shot to me, there is stuff that really stands out in HA that is barely visible between the lagoon and trifid in my OSC image.

The background is fairly bright, could you get away with marginally less stretch, or if you are processing in Photoshop, maybe a bit of a tweak in curves to take some of the intensity out of the core of the Lagoon? There is a heap of detail in there that is just visible but you should be able to tease a bit more of it out.

What are you stacking the image in?

vlazg (George) · #3 01-09-2019, 09:13 PM

Quote:

Originally Posted by The_bluester

Looks quite a nice shot to me, there is stuff that really stands out in HA that is barely visible between the lagoon and trifid in my OSC image.

The background is fairly bright, could you get away with marginally less stretch, or if you are processing in Photoshop, maybe a bit of a tweak in curves to take some of the intensity out of the core of the Lagoon? There is a heap of detail in there that is just visible but you should be able to tease a bit more of it out.

What are you stacking the image in?

Thanks Paul, I’m using Pix for processing and Photoshop to add the Ha. I’ll try your suggestion but I don’t like the background too dark, it starts to look unnatural in my opinion
Cheers

multiweb (Marc) · #4 02-09-2019, 02:51 PM

That's very good George. Really excellent.

I was looking at your camera. It's a 6 micron pixel size sensor. Confused because your image scale doesn't look undersampled at all. I did a similar 4 panel drizzled x2 with an FSQ and 5.4 microns and Not even close to the details you've got. Did you use an extender?

vlazg (George) · #5 02-09-2019, 02:59 PM

Quote:

Originally Posted by multiweb

That's very good George. Really excellent.

I was looking at your camera. It's a 6 micron pixel size sensor. Confused because your image scale doesn't look undersampled at all. I did a similar 4 panel drizzled x2 with an FSQ and 5.4 microns and Not even close to the details you've got. Did you use an extender?

Hi Marc, i used drizzle integration in PIX, is that what you use?

multiweb (Marc) · #6 02-09-2019, 03:07 PM

Quote:

Originally Posted by vlazg

Hi Marc, i used drizzle integration in PIX, is that what you use?

Yes I do. Got my numbers wrong. I'm at 7.8 microns with a bayer matrix. You're using a mono at 6 microns. I didn't think there would be such a big difference but there it is. Amazing details for a field that size.

The_bluester (Paul) · #7 02-09-2019, 04:50 PM

I prefer the background to be relatively dark, so long as nothing is actually clipped to black, there is probably more gain to be had in curves to bring down the highlights in the middle of the lagoon a bit more while not pulling the stars down much, there are some details and stars in the core that you can likely get to pop out a bit more.

vlazg (George) · #8 03-09-2019, 09:33 AM

Hi Paul, is this better?

https://www.astrobin.com/7rp6md/0/

The_bluester (Paul) · #9 03-09-2019, 10:23 AM

To my eye yes (These things are always subjective) in that there is detail brought out in the brightest bit of the Lagoon, but without loosing the faint HA around it (That my OSC does not pick up nearly so well)

HA should be within the range of my camera nicely but the region around the lagoon is only just starting to show up at 5 minute subs at F4.9. Next year I might try 10 minutes and see if I end up with too many burned out areas and stars, assuming I have not changed camera by then.

gregbradley · #10 03-09-2019, 01:53 PM

That's great. The classic framing.

A little bit of cropping needed showing the various layers.

Greg.

Andy01 (Andy) · #11 03-09-2019, 07:17 PM

Hey George, how’s it going? The revision looks great!
Well done

vlazg (George) · #12 04-09-2019, 07:32 AM

Amazing details for a field that size.

[/QUOTE]

Thanks Marc,the FSQ is amazing and a large sensor with smallish pixels help, plus drizzling

Thanks Greg,

amazing what you miss when you look at an image for too long, i will crop it at some stage.

Paul,

thanks for your input, it helped greatly

Hi Andy,

Ive been out of it for a while due to a motorcycle accident, good to be back

The_bluester (Paul) · #13 04-09-2019, 08:42 AM

Ha, I was so busy looking at the core of the lagoon that I did not even notice the stacking showing up around the edges.

I think it is a good target to hone skills on, a big dynamic range to challenge the processing and more or less make you do some non linear stretching to get the best out of it (I try to do as little non linear stuff as I can) but not so huge a range as M42 and needing multiple exposure lengths and masking of different layers to bring them together.