I am looking at images of 8mm film frames, made in 1963 with a color 8mm camera and 9-27mm lens. The lens was set to 27mm (max, telephoto) which sets the maximum exit window. The images show the frames with intersprocket area, and not just the part corresponding the standard size. For example,
http://jfkassassination.net/russ/z218.jpg
I noticed that the area that corresponds to standard frame, which is about 3/4 of the frame width measured from the right side, shows consistent distances. However, the last 1/4 of the frame on the left side, corresponding to intersprocket area, shows distances widened. You can even notice by the faces wider than they should be. Is it expected for telephoto lens on the peripheries of exit window? After all, the lens should be designed only for the standard frame size and anything beyond could be distorted. What is the technical term to describe this?
http://jfkassassination.net/russ/z218.jpg
I noticed that the area that corresponds to standard frame, which is about 3/4 of the frame width measured from the right side, shows consistent distances. However, the last 1/4 of the frame on the left side, corresponding to intersprocket area, shows distances widened. You can even notice by the faces wider than they should be. Is it expected for telephoto lens on the peripheries of exit window? After all, the lens should be designed only for the standard frame size and anything beyond could be distorted. What is the technical term to describe this?