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In fact you've also done many people a favour by illustrating graphically just HOW important camera rotation is for extra widefield by not cropping in too much Marc. Its pretty obvious just how much the camera tilted over as you went along.
The only other way I've found handy to get my head around this is watching the PA rotate as you move around in Starry NIght with a FOV indicator active (probably stating the obvious to anyone how has ever even dipped a toe into mosaics)
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