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jenchris
05-08-2011, 12:33 PM
I'm only just gettingthe polar alignment up to speed so my subs have beenrather short - just getting up to three minutes.
This shot is a stack of about 1 1/2 hrs all up.
There's doesn't seem to be as much information there as I'd expect, am I right to be using sigma clipping in the DSS stack?
If I stretch it too much it becomes grainy and grey and I hate that.
Any suggestions would be appreciated.
I think I might push the subs to about 5 mins now that I've got the guiding working right - should I dump the previous information or add the lot together?
multiweb
05-08-2011, 01:51 PM
At that FL you'll have to do around 10min subs minimum. Is your camera modded?
jenchris
05-08-2011, 01:53 PM
no it's still got its ...... fliters
multiweb
05-08-2011, 01:55 PM
Then you're best shot is to go wider field. It's going to be hard yakka with a DSLR that close up. You can do it tough. Just going to take longer and a lot of subs. Keep stacking.
jenchris
05-08-2011, 01:55 PM
This is the stack before I added the last batch of lights
multiweb
05-08-2011, 02:37 PM
That looks better. Double that up again and you'll start getting rid of background noise. It's a numbers game.
renormalised
05-08-2011, 03:04 PM
Wings:):P
jjjnettie
05-08-2011, 04:16 PM
More subs Jen. As many as you can.
you're going forward in leaps and bounds my girl. :)
jenchris
05-08-2011, 04:29 PM
Why miss JJJ - I'm old enough to be someone's granny!
And if I was in Kentucky (dueling banjos country), I'd be old enough to be someone's great granny!
Thank you for your input and your sweet compliment! :D
richardo
05-08-2011, 04:45 PM
Going great guns Jenny!
Looks like your tracking/ guiding is going well at this fL. Not easy to get good round stars as you have.
As Marc and JJ have suggested, yep, keep on gathering data and adding to it.
In the end you'll beat the noise with more and more subs.
The more data, the easier it will be to process and stretching will not show as much noise.
Your colour will become much deeper as well.

Keep up the good work!

Rich
Octane
05-08-2011, 05:46 PM
You're doing awesome, Jennifer.

Long sub-exposures, lots of them, at say ISO-800, with matching dark frames and flat calibration will get you there.

And, yes, sigma stacking is your best option.

Keep at it -- perfect your alignment so that your guider doesn't have to work as hard -- aim for ten minutes if possible.

H