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What is Back Focus when referring to camera lenses?

Or front focus for that matter? I have been reading lens reviews lately and I came across a review from someone stating,"This lens tends to back focus at xxxmm or front focus at xxxxmm." What does this mean.

Thanks.

How do you Focus on a non centered object using a point and shoot film camera?

I need to know how to focus on a object that is not in the center of a picture using a film camera. (point and shoot) It is auto focus, so I'm guessing I can't focus on a non-centered object.