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This quick calculator shows the amount of parallax error that may occur using a fixed-parallax scope to sight onto an object placed at a known distance. 'Maximum parallax error' is in the context of the viewer setting up with their eye centered on the ocular lens -- using it as is normally intended. Strictly speaking the maximum possible error is double the number you will get below if you sight to your destination by peeking through it from the edge of your scope... which nobody actually does. For a true theoretical maximum double the returned result values.