Originally posted by Wasp Samynag 8mm in K mount on Samsung NX1 with adapter. The image is not de-fished and looks quite realistic, but the horizon gives it away. I was trying to get it in the middle of the frame but was off slightly. Drat, I will not pass that way again soon.
-- In photoshop you can use the edit transform warp to (reasonably) straighten the horizon.
-- Another way would be to enlarge the image veriically so your image is at the top of a much larger (taller) image. Thus the horizon is near the top of the image and then do a lens distortion correction.