Correcting Verticals, if not, why?

[Terrywoodenpic]

Sorry Ali, but you've got to be a lot higher than that. The first picture showing curvature was taken by Alexander Dahl in 1933 from a balloon at about 36,000 ft. I've flown at 65,000 and it's not really obvious at that height until it's pointed out to you.

It's easy to think that a horizon and other things disappearing in to the distance to the sides are falling. I've seen it on many of my pictures, and knowing that the camera was level I've still tweaked them a bit.

Actually When you go much higher what you are seeing is a larger field of View. So the difference shown by a line drawn between the ends of the horizon and the middle of the curve is greater . However the curvature is the same.what ever the height.

Simple geometry...