Small Magellanic Cloud @ 200mm f4 - Page 2

dugnsuz (Doug) · #21 23-09-2008, 03:26 PM

Quote:

Originally Posted by winensky

Lovely wide field, great colour. Couldnt pick the focus problem but my eyes are getting worse by the month. At ISO1800 and those exposure times the nebs are comming out to play.I don't knoww if you can selectively unsharp and layer the glob but a great job all together.

Thanks Matt.
One day I'll get my act together and really plan one of these imaging sessions!! Flats, Darks, various exposure times etc etc.

Jen · #22 23-09-2008, 06:08 PM

Nice pic Doug

dugnsuz (Doug) · #23 24-09-2008, 12:04 AM

Quote:

Originally Posted by Jen

Nice pic Doug

Cheers Jen - thanks for having a look

Doug

TrevorW · #24 24-09-2008, 04:24 PM

Nice Dougie but was is the opitmal ISO setting for images i've tried 400 and 800 without that much difference. Is it better to take more shorter timed exposures or less longer ones. Personally I would think to err on the side of more shorter exposures reducing the effects of rotaional distortion, tracking errors and noise pollution etc

AlexN · #25 24-09-2008, 04:36 PM

in ideal conditions you would go for longer exposures.. Rotation and tracking shouldn't be a problem if you're aligned properly..

dugnsuz (Doug) · #26 24-09-2008, 05:09 PM

Quote:

Originally Posted by TrevorW

Nice Dougie but was is the opitmal ISO setting for images i've tried 400 and 800 without that much difference. Is it better to take more shorter timed exposures or less longer ones. Personally I would think to err on the side of more shorter exposures reducing the effects of rotaional distortion, tracking errors and noise pollution etc

No Trev,
Live on the edge mate!!!

I'm just trying to push the little envelope I find myself in!

Sometimes it pays off - in this case I'm not convinced, I sacrificed NR to get the large numbers of exposures in the given time.Also no LP filter didn't help.

Re your question - I've always looked at it thusly...
I can take a number of 5min and 10min subs. The 10min sub will record fainter photons than the 5min sub. I can stack as many of those 5min subs as I like - the fainter photons recorded in my 10min subs will never be there in that 5min stack. So my goal is to stack as many 10min exps as possible

Genius!!