Hi Eric,
Well, the extra hardware is a general catch all, yes I use water cooling when needed. It wasn't necessary for this image.
There was some thin stuff that lent a bit of murkiness to the sky. It didn't have the "snap" that it sometimes will have.
Lastly, 6nm refers to the Ha Filter <g> Sorry for the confusion, and no, it wasn't used for this image so I should probably fix that.
Thanks for the comments. I'd like to get some more data for this and bring out the details a bit better. Always something else to try and do <lol>
Best Regards
Bill