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!
(http://a8.sphotos.ak.fbcdn.net/hphotos-ak-ash3/s720x720/601488_4518358878364_1476921531_n.jpg)
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!
(http://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/309195_4518359638383_216317248_n.jpg)
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
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.
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
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