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Old 11th December 2012, 07:03 PM
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rich rich is offline
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Join Date: Nov 2008
Location: Shebbear, N Devon
Posts: 1,642

I did a note on this subject not long ago and I think it was on this forum. Nemesis is right, in dioptre strength it is the reciprocal of whatever 50ft is in metres. A normal photographic close up lens will be far too powerful.
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