Quote Originally Posted by BrianShaw View Post
What is past infinity? Please answer using engineering terms, not metaphorical psychobabble.
When the index is set at infinity, the lens is "past" infinity (lens closer than it's infinity focus) and the index has to be set at a closer distance to bring an "infinite" (say the moon) object into focus. Sounds like the OPs lens needs to be set around 20 meters to focus at infinity.