Hi there everyone.
Same data as before.
Some selective, gentle and careful curve manipulation to keep the core under control
Revision full version here http://www.astrobin.com/149808/B/
Thanks for looking
Hi Scott,
something has happened to the keyhole -
it looks like splotches where the stars should be.
There are also black rings around many stars.
Would you be able to post the original un-stretched stacks & let me have a go at processing?
Perhaps the keyhole was over exposed - exceeding the well depth?
Did you check the levels to see if the were over 65,000?
Al, I know what the issue is. 15 minute subs. Full wells. Will have to reshoot shorter exposures...one day.
Thanks for the feedback
Hi Scott,
sorry to hear that.
I've been caught out like that too.
I now check every sub frame while I'm waiting for the next exposure.
I check focus as FWHM, & whether I've exceeded the well depth.
Al, I know what the issue is. 15 minute subs. Full wells. Will have to reshoot shorter exposures...one day.
Thanks for the feedback
It's almost impossible not to exceed full well on the cores of bright stars with any AP set up. At f/9 my star cores are saturated even in exposures of a few seconds. However, I doubt that you've hit saturation of nebula details in 15 minute narrowband subs. So, I think what we're seeing is more likely to be processing artifacts rather than subs that are too long...
