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Graham,
Assuming you're using the Eos Canon, trying quickly scrolling through your images in Canon's digital photo prof (supplied with the camera) What I find is if I take say 20 lights (eg 4 min each) and I quickly scroll though the previews in DPP, I can clearly see the motion of each frame and if my PA is out (eg I rush in and only do a meridian drift check) I find the images appear to rotate. Ie scrolling through DPP with those 20 items, I can clearly rotation. This is a clear indicator PA is not perfect
Cheers,
Darrin...
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