SunValley, I totally might be able to get a better focus! The A* 300mm is my first manual-focus lens that doesn't have a hard stop at infinity, so I was never perfectly confident of the focus. I was also shooting wide open, and I'd expect some increase in sharpness if I stopped it down to about f/5.6 (though I'd want to get further from the light pollution before I start shooting that way).
csa, if you can tolerate the cold you'll usually get better star results (in my experience). Higher temperatures tend to mean more atmospheric motions at low altitude where the air is densest and most likely to cause optical problems. Of course, cold temperatures aren't too nice to camera batteries or my fingers, so I totally understand waiting for warmer seasons!
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