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Orion Nebula and lots of dust

Started by MarkS, Jan 17, 2016, 18:56:14

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MarkS

Another from Friday night.

Modified Sony A7S on Tak Epsilon 180ED.
3 hours of data in 30 second subs at ISO 2000 plus 10 min at ISO 640 and 10 min at ISO 200.



Larger version here:
http://www.markshelley.co.uk/Astronomy/2016/orion20160115large.jpg

There's a lot more I could do to bring out more detail in the brighter areas.  This was created simply by stretching one single HDR image covering the whole (massive) dynamic range.

Mark


Fay

Mark, dont know what you are complaining about with that camera. that is great, you will have gone through the whole universe in 7 days!!!!!

I am wondering if I should get one now!!!!!!!!!
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Carole

Fantastic image Mark, amazing amount of dust.

Carole

MarkS

Oddly, this image didn't seem to have much of a problem with the coloured banding - I don't know why.  Maybe it's more disguised by the dust structures.

Mark

RobertM

Oh what it is to have dark skies ...

If that was mine then I'd be framing it and putting it on the wall !!!

Robert

JohnP

Very nice indeed Mark - super image - the whole nebula looks like it is veiled in dust - Never see this any images I take :-( John

Mac

QuoteOddly, this image didn't seem to have much of a problem with the coloured banding - I don't know why.  Maybe it's more disguised by the dust structures.
Or the dust is not actually dust and you have discovered another banding problem,  ;)

Nice image.

Mac.

MarkS

An adjustment in PixInsight using HDRMultiscaleTransform has improved this image making it more "punchy" and restoring contrast in the very bright areas.  I'm very pleased with the result now - it's a rare thing for me to say.



Larger version here:
http://www.markshelley.co.uk/Astronomy/2016/orion20160115v2.jpg

All it needs now is some noise reduction.

Mark

Carole

QuoteI'm very pleased with the result now
Much better detail in the nebulae.
and so you should be Mark, it's an excellent image.

Carole

RobertM

That's one of the best images I've ever seen of that area !  Yes it may need some NR but that'll be easy - you've already done all the hard work.

Have you used deconvolution on it yet (I'm thinking primarily about resolving the trapezium) ?

That is APOD material.

Robert

MarkS

Quote from: RobertM
That's one of the best images I've ever seen of that area !  Yes it may need some NR but that'll be easy - you've already done all the hard work.

Have you used deconvolution on it yet (I'm thinking primarily about resolving the trapezium) ?

That is APOD material.

Robert

Thanks Robert.   Much appreciated.

I haven't done any deconvolution or sharpening on it, nor any noise reduction.  I'll give both a go when I get the chance.

APOD has recently had an "Orion Nebula with Dust" so I think I'm out of luck on that score:
http://apod.nasa.gov/apod/ap151229.html

Mark

Fay

very nice Mark. have you changed your mind about the banding now? is it easier to sort out than you thought?

Fay
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

MarkS

Quote from: Fay
have you changed your mind about the banding now? is it easier to sort out than you thought?

I hope so.  It looks like I can get around it by exposing the sky fog much further to the right - looking at the back-of-camera histogram that would mean getting the peak 3/4 from the left instead of 1/4 or 1/3 which is the normal recommendation.
Here's the post where I explain it: http://www.cloudynights.com/topic/519941-sony-a7s-split-sensor-and-banding/?p=7015094

I just need to verify this on a real imaging night.

Unfortunately it's too late for the data I have already shot - I'll never be able to calibrate out the banding.  Possibly I can try some kind of manual correction.

Mark

Fay

You have worked very hard to get it right Mark, i bet you slept ok last night!
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

MarkS

I've gone over to the dark side - now that Photoshop is so cheap (£10/month) it seemed a good time to try it out.

So I now have Photoshop, Lightroom and Adobe Camera Raw.

ACR has some nice features e.g. noise reduction that works really well and moe intuitive than the PixInsight equivalent. Despite the name it doesn't only operate on raw files. So my 16bit TIFF could be opened in Photoshop and then Filter| CameraRawFilter takes it back into ACR to adjust exposure, perform noise reduction etc.

So here is the (newly tweaked) version 3 of the Orion Nebula:


Larger version here:
http://www.markshelley.co.uk/Astronomy/2016/orion20160115v3.jpg

Mark