The dark lanes certainly stand out there Lester which gives it some nice contrast.
Give Jjj's advice a go. I find F4 a nice stop on my 50mm.
Crux is certainly one of those southern gems!
Darrin...
PS Greg, would stopping a F1.2 lense down to say F4 help resolve the magenta problem or this a characteristic of a very fast lense that stopping down can't really resolve to a great extent (at least in relation to Lester's image)? Just out of interest.