Print Page - Cocoon Nebula HaLRGB from DSC

Title: Cocoon Nebula HaLRGB from DSC
Post by: Carole on Oct 11, 2015, 15:24:31

Taken on Friday night from Cairds:

Two imaging cameras and scopes HEQ5
A: WOZS71 + FR x 0.8/ Atik314L
B: SW ED80 + FR x 0.8/ Atik460

A: 11 x 600 Lum, 5 x 600 Red, 3 x 600 Blue, 3 x 600 Green
B: 16 x 600 secs Ha
Total imaging time 6 hours 20 mins

That WO Scope is a so and so for giving blue halos, very difficult to deal with during the processing. I am not alone with this problem, there are threads about it.

(http://cdn.astrobin.com/images/thumbs/4e2f3727398ac5f9fbeb159f4bec94fb.1824x0_q100_watermark.jpg)

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: Ivor on Oct 11, 2015, 21:23:18

You've captured some detail in nebula as well as keeping the star colour, great result.

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: Carole on Oct 11, 2015, 21:24:21

Thanks Ivor.

Carole

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: Fay on Oct 12, 2015, 08:25:27

well you did not waste any time, while you were there Carole. lots of images to show for it

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: Carole on Oct 12, 2015, 08:50:23

Thanks Fay, yes I like to make maximum use of the darks skies when I am there.

Carole

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: JohnP on Oct 12, 2015, 11:07:31

Halo's are a right pita..... I remember exact same issues when I imaged this down at ollies place about 7 or 8 years ago..& that was with ZS66.. :-( I guess that's why people spend a lot of money on scopes...

Nice image though & the dark lane is showing nicely.

John

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: Carole on Oct 12, 2015, 12:15:18

I agree John, but I don't seem to get it with the Skywatcher scopes.

I have just had a thought - I might swap the Filter wheels over so I am using the Skywatcher for the colour and the WO for the Ha/Oiii and luminance filter I just bought this morning. Maybe that might eliminate the blue halo problem. All trial and error.

QuoteNice image though & the dark lane is showing nicely.

Thanks John.

Carole

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: RobertM on Oct 12, 2015, 13:53:20

You've been busy Carole, I'm glad there were some clear skies at DSC.

A very nice image though I'd say that the stars look all the same colour (not that it's necessarily wrong).

Robert

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: The Thing on Oct 12, 2015, 15:57:13

You are prolific Carole, give you a dark sky and a whole menagerie of objects get captured! Nice image, it really looks prominent on my screen.

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: Carole on Oct 12, 2015, 16:56:59

Thanks Robert and Duncan.

I agree about the stars Robert the only ones that are different are those with the halos around them. Well all I can do is put them together and this is what comes out. I did tone the colour intensity down a bit as they were much more yellow and the halos were brighter, but that's all I did.

Carole

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: MarkS on Oct 13, 2015, 06:23:05

That's looking really good Carole. I wonder if it would be possible to see the brown dust if you adjust the black level a bit?

The nebula itself needs a bit more blue I think - I wonder if you can enhance the blue in the nebula without increasing the blue haloes of the stars?

Mark

Title: Re: Cocoon Nebula HaLRGB from DSC
Post by: Carole on Oct 13, 2015, 07:35:49

Thanks Mark.

QuoteI wonder if it would be possible to see the brown dust if you adjust the black level a bit?

I did try but nothing doing.

I have since seen another cocoon where the poster did 900sec subs in luminance and this was starting to show up the dust, so might give that a try next time. Also see my comments above about swapping the filter wheels.

QuoteYou are prolific Carole, give you a dark sky and a whole menagerie of objects get captured!

:lol: :lol:

Carole

Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Carole on Oct 11, 2015, 15:24:31