Well done again Fred but I think M17 needs to be imaged with a wider fov because, to me at least, the interesting structures are in the tail so to speak ( the curly bits ).
Ofcourse this is just a personal preference and isn't meant as a criticism of your technique.
You have the patience of Jobe doing these extreme long exposures, I assume you set and forget with the appropriate software or am I wrong.
Cheers
