I just recently built an anamorphic lens, and as far as I know got the prisms aligned properly. However, the pincushion that I am experiencing is only on the bottom of the image, its more or less a straight line on top.
1: Is this because I have the lens shift on my PJ aimed downward? (PJ is almost level with top of screen)
2: Will a curved screen actually fix this or will it introduce barrel on the top of the image?
3: When using an anamorphic lens are you supposed to have the PJ lined up in the dead center of the screen? (obviously its centered horizontally, but is it also supposed to be on the vertical center as well?)