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Some thoughts on the Olympus 1.45x teleconverter lens

(f-stop) = (focal length) / (clear aperature) The "clear aperature" is the size of the entrance pupil, approximately the size of the front element. This teleconverter adds a new front element 1.4 times the size of the existing element.

Fri Nov 1 12:16:57 PST 2002

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