AstroBin

AstroBin

AstroBin

[RCC] Heart nebula. First time looking for feedback! Requests for constructive critique · Ethan Pearson · ... · 3 · 441 · 0

Mast3rDuck 0.90
Ethan Pearson
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So I've always been more of a lurker of forums than interacting, but I've enjoyed where the astrophotography journey has taken me and would love to know more about how to do more with my images and such.   Going to do an info dump below on the method to my madness and interested if there are any ideas I could do different/better!  Enjoy the image, I had a blast with it

https://www.astrobin.com/yf00wz/

This is my latest image on the heart nebula I got over the weekend with my 10" newtonian.  It is one of the first images where I decided to spend time and learn the tools of pixinsight.

Some of my mindset:
As far as integration goes I'm sure I could optimize it better.  15 minute subs is probably overkill, but I got my rig tuned to the point over the summer that I was curious about how a session of it looked fully stacked.  Also spending my time imaging multiple nights on one targets to make the best of it vs my first year of imaging where I just wanted to see everything.  It could be a placebo but I feel like I didn't have to do too much with the image during my process.  I know there are optimal exposure time calculators but I haven't looked close at them to really know what I should be doing.

My workflow on this image looks like this:

Pixinsight:
Stack the 900" and 60" images separately with WBPP (default settings)
Dynamic Background Extraction
BlurX
SCNR (ive tried the photometric and spectrophotometric color calibration but it does weird stuff with my image compared to siril. have to play around more)
NoiseX (0.45 reduction and 0.2 preservation)
Star align
StarX the 900" image.

Siril:
GHS with even weighted arcsin stretch until nebula barely visible.  Then GHS or inverse GHS until my channel levels are where I want them.  (I'm more comfortable with the Siril GHS, need to sit down and watch videos on how to do similar in the pixinsight version)

Put the 60" star image back in pixinsigt and run through StarX, Turn the 900" starless image, 60" star image into a tiff for photoshop.

Photoshop:
Im still more comfortable with the tools here for final processing as well.  Merging the stars onto the starless image, running it through camera raw filter, levels, stuff like that.
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jml79 4.17
Joe Linington
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I’m not going to offer anything on the processing because it looks pretty excellent to me. I wouldn’t use 900s subs simply because I am sure I would lose half of them. 300s is my personal balance between sub length and risk. I’m also not sure my camera could handle the longer subs, it’s not an IMX571. I am curious about 7hrs of RGB for the stars. When I’m capturing stars I go for short subs and no where near that much integration. I use 15s subs and capture 15-20minutes per channel or a total of 45-60m. It’s enough and some people tell me it’s to much. I’d rather spend the extra 6 hours on the target.

Thats all I have. Excellent image. I’m impressed that a CEM45 can handle a 10" newt for 15m subs.
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WhooptieDo 10.40
Brian Puhl
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I think the only major thing that stands out to me is the core is blown.  Try to be a little more careful with your curves and stretching.  

The rest is subtle stuff, like maybe more color, it feels a bit muted.  Stars feel a bit green to me, lacking color overall.  Most of that is personal taste.
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Mast3rDuck 0.90
Ethan Pearson
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Joe Linington:
I’m not going to offer anything on the processing because it looks pretty excellent to me. I wouldn’t use 900s subs simply because I am sure I would lose half of them. 300s is my personal balance between sub length and risk. I’m also not sure my camera could handle the longer subs, it’s not an IMX571. I am curious about 7hrs of RGB for the stars. When I’m capturing stars I go for short subs and no where near that much integration. I use 15s subs and capture 15-20minutes per channel or a total of 45-60m. It’s enough and some people tell me it’s to much. I’d rather spend the extra 6 hours on the target.

Thats all I have. Excellent image. I’m impressed that a CEM45 can handle a 10" newt for 15m subs.

The reason for the large amount of integration on the 60” session was honestly just being lazy lol. There wasn’t anything else I wanted to image at this focal length and rotation at the time. Decided to just say screw it, let’s go a whole night since I have plenty of clear nights right now. I like just kind of messing around with imaging plans if I’m able and trying out ideas.  Normally I only max at an hour, hour and a half and just pick the best subs to taste.  And the GEM45 has been a trooper with this thing! It’s been consistently guiding at under 0.6” with an OAG and an ASI120mm.  
Brian Puhl:
I think the only major thing that stands out to me is the core is blown.  Try to be a little more careful with your curves and stretching.  

The rest is subtle stuff, like maybe more color, it feels a bit muted.  Stars feel a bit green to me, lacking color overall.  Most of that is personal taste.

I definitely want to do a revision where I bring the core back in. As I was stretching I started to see defined shapes in the whispy gas and wanted to see more of that with the first pass.  I know what you mean by the color. As I was stretching the darker areas started to get pushed into the blue and was hard to bring back. Ended up desaturating a bit on purpose to tame that. Something else to play around with next pass as well!
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