Thanks for all the advice. I took off the UV filter, and no more ghosting in any of my shots.
I ended up taking about 15 shots, some in auto, some in manual.
My best result was in manual at ISO 100, 1/180, F9.5, hand-held with shake reduction, at 200mm with the DA 50-200 . The moon was focused dead center.
The shot was taken around 2am Pacific. I didn't have an opportunity to shoot earlier as I stayed in the office late and then had my birthday dinner with a friend earlier.
This is a 1:1 crop, otherwise completely unprocessed. I wish I had a bigger zoom now ... or more pixels.
Wheatfield, I love your shot. Was the moon really that color ?
You said you have a 600mm lens - which one ?