fabulous images. I made some DSS attempts back with my DA 55-300, but the ISO noise at 16000 was pretty bad, and stacking 600 shots got old fast lol. and with that lens, at 300 i wasn't getting great light.
But none of my attempts came close tot he beauty of your shots, I would LOVE to be able to get those types of shots, perhaps with my new DA* 300 I might have a chance
I had considered upgrading to the K3 for the built in GPS, but if it isn't all that accurate I would get the tracker others had mentioned, It got pretty good ratings.
But all said, those are beautiful shots, I am quite envious