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I just fire up the EOS utility on my laptop, activate remote liveview, enable 10x magnification (important!), point at a bright star and click the manual focus buttons left and right until I have the smallest circle/dot possible. It's a bit more accurate than adjusting the focus by hand. After that I turn off auto-focus on the lens so that it keeps the setting, then swing the camera around to the ultimate object of interest.
Easier on longer focal lengths, but I'm quite sure I did that at 50mm too.
Pic below (without star)
Last edited by deadsimple; 10-08-2009 at 09:25 PM.
Reason: spelling
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