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Maybe no great help but I always find my terrestrial infinity focus is just the tiniest bit off for the night sky.
What I do is take a series of shots (Samyong 14mm f2.8 manual focus lens with very inaccurate infinity markings) and run inside to the computer and check the larger images on the computer screen because I see nothing under a 27" monitor. Images which look incredibly sharp on my camera review screen I've later found far from sharp after taking 150 or so images and going inside to process them. To me that's a wasted night and a lot of frustration.
I've spent numerous nights out fine tuning the focal point on this one lens for wide filed MW images and when finally spot on, I marked the lens with a line of red nail polish so I can find it easy now whenever I bother going out.
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