Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Fay on Sep 20, 2008, 13:09:07

Title: PACMAN
Post by: Fay on Sep 20, 2008, 13:09:07
(http://farm4.static.flickr.com/3137/2871743183_0c5e575dfe_b.jpg)

There must have been  500 planes going over last night!!!!!!!!

17x300secs Ha,Atik 314L

No darks or flats as power went. I use my jump start for the Atik. Must sort out a mains connection.

Not nearly as good as Chris's.   Noisy
Title: Re: PACMAN
Post by: RobertM on Sep 20, 2008, 13:19:28
Very nice Fay, I had the same problem with planes myself.
Title: Re: PACMAN
Post by: Mac on Sep 20, 2008, 14:40:17
Nice image,

How you finding using the atic,
Title: Re: PACMAN
Post by: Fay on Sep 20, 2008, 15:18:23
Well, Mac. same as using the SX I suppose. I want to learn to use the Artemis capture programme as you can control the image size on screen. On Astroart it is either 50% or 100%.

Not had that much practice at the moment though.
Title: Re: PACMAN
Post by: Fay on Sep 20, 2008, 15:49:14
(http://farm4.static.flickr.com/3228/2872008531_1a010e4606_o.jpg)


I think this may look a bit better. Haloes around stars, anyone know how to get rid of them?
Title: Re: PACMAN
Post by: MarkS on Sep 20, 2008, 16:10:33

Fay,

That's a good image - you certainly can't complain about that.  Lots of detail and nice round stars.

One thing puzzles me though - it's a monochrome camera you are using, isn't it, and you were using an Ha filter.  So I don't understand why I'm seeing coloured noise in your image.  At what stage did that appear I wonder?

Mark
Title: Re: PACMAN
Post by: Rocket Pooch on Sep 20, 2008, 16:14:50
guys the main reason why I do not have noise is because I do a non linear stretch on the image which removes the high and low noise.   
Title: Re: PACMAN
Post by: Fay on Sep 20, 2008, 16:43:11
Mar, I bet I did not change the mode from rgb to grayscale
Title: Re: PACMAN
Post by: Fay on Sep 20, 2008, 16:44:01
What program is non linear stretch in Chris?
Title: Re: PACMAN
Post by: Rocket Pooch on Sep 20, 2008, 18:59:45
hi fay,

what are you stacking with, maxim, astro art and aip all have non-linear functions in them.

chris
Title: Re: PACMAN
Post by: Fay on Sep 20, 2008, 19:10:33
Hi Chris yes I saw that Maxim has it & I have downloaded an article on DDP. I will have a go tomorrow, thanks
Title: Re: PACMAN
Post by: RobertM on Sep 20, 2008, 19:16:34
Fay,  I nearly always use DPP in Maxim.  It was designed to emulate the characteristics of film for digital photography and works out to be ideal for Astro images.
Title: Re: PACMAN
Post by: Fay on Sep 20, 2008, 19:18:33
Oh I called it DDP, oh well.

DO you use it before any processing or after, Robert? Are there any set rules for settings?
Title: Re: PACMAN
Post by: RobertM on Sep 20, 2008, 21:58:08
Ooops did I say DPP !  Fay yes it is DDP... must have been thinking of something else at the time.

Look up 'tutorial DDP Maximdl' in google and open at the first entry, there is lots of very useful stuff on that site...

Title: Re: PACMAN
Post by: Fay on Sep 21, 2008, 10:11:15
Robert, I have had a look & an attempt at DDp but bit complicated at the moment. Perhaps Chris can make it clearer next week. I have printed of that info on the site you suggested.
Title: Re: PACMAN
Post by: RobertM on Sep 21, 2008, 12:09:48
It's post processing so you'll get plenty of time to sort that out - just make sure you capture some good data while you're there !
Title: Re: PACMAN
Post by: Rocket Pooch on Sep 22, 2008, 11:15:10
ah ha a whole week of cheese and red wide and beer, some more cheese red wine and beer, and if we're lucky cheese whilst imaging.  with a beer chaser.
Title: Re: PACMAN
Post by: JohnP on Sep 22, 2008, 11:37:42
ummm. sounds lovely - guess it's a good job I like cheese, red wine & beer.... Sounds like we might all come back with an 'attack of Gout!!!!! '

John
Title: Re: PACMAN
Post by: Fay on Sep 22, 2008, 15:00:05
We might come back 3 stones heavier!!!!