i just discovered there is a distortion in my digital camera lens. normally it would go unnoticed, but i was trying to take pics of a rectangular painting today, and no matter how parallel to the picture plane i am, one side of the rectangle is distorted. the top of my image skews down to the right. i know it isn't my aim, because that corner is screwed up no matter how i stand. aim would affect more than one corner anyway. i take shots where three sides of the canvas are parallel to the edge of the image, and that upper right curves down. i can work around the problem with some paintings by cropping, but ones like this i am f#%@d because there is a border painted into the canvas that would be cut off.