Ambermile - EP's can easily produce non-parallel rays, we call this "out of focus". When you move the EP toward or away from the correct focal point then you change the output rays from parallel to either diverging or converging.
The human eye is only capable of focusing light that is very close to parallel, but I'm not sure about an afocal arrangement with a camera instead of a human eye. Again, I think the culprit is that the focus is incorrectly set on the scope so that the light rays are not parallel, and the operator has tried to compensate for this by adjusting the focus on the camera.
regards, Bird
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