Iris Nebula

[JonH]

2:25 worth of 5 min subs (I fell asleep) at iso800 stacked in DSS

This is after stacking, it's a lot better now than when I first stacked it, but there is still not something right in the top left corner, as for what or why I haven't a clue!



And this is after cropping and half hour worth of my rather useless attempt at processing in photoshop, now there be a steep learning curve!

[Carole]

That's not at all bad Jonathan for only your 2nd or 3rd image, particularly so for such a faint object. 
I am not sure what the gradient is in the top left hand corner. 

Carole

[JonH]

I'm pretty sure the change in gradient was thanks to the moon, by 2am it was getting pretty bright.
I might try stacking again but without some of the later subs and see if that helps.

[MarkS]

I've only just seen this.  The Iris Nebula is a pretty tough target, so you've done a reasonable job of this.

Are you shooting from a relatively dark location or do you have a lot of light pollution?

You didn't say if you used a CLS filter for this one.

Mark

[JonH]

I didn't have a CLS filter when I took this so no. There wasn't really a lot of light pollution but the moon was up and getting really quite bright in most of my later subs.

Jon