Even when I manually rotate and skew (in PS) I always believed 3 guides were necessary for a well 'uprighted' photo; one for a line near center and one each out toward left and right of center.
Lately my LR gives an error when I add a 3rd guide, and won't do a correction based on that guide.
What gives? :-)
In my experience- I have successfully used two uprights and two horizontal guides on an image.
I think the Lightroom dialog is entirely different to Photoshop.
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