The title has poses the question.
Joanna Carter
31-Oct-2010, 17:10
This has been discussed many times before. Take a 5" x 4" piece of card, cut a hole 2.5" x 2" and hold it in front of your eye with a piece of string, knotted at half the focal length of your lenses, to measure the distance from your eye to the card.
It's cheap and effective.
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