I have a horizontal photo and want to crop it to a vertical orientation - taller than it is wide, in other words. I also want to constrain the cropping so the width is 80% of the height in order to print on 8x10 inch paper. LR's preset cropping aspect ratio of 8 x 10 won't do this because it insists that the "10" be along the width of the original photo and the "8" be along the height of the original photo. If I enter a custom aspect ratio of 10 x 8 it does exactly the same thing. Is there any way to do what I want?