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Thanks Darryl, yes you are quite correct, the link does say that. Quite confusing in a way because no reason is given in the ray trace or the formula for this, unless I've missed something. My tentative experiment the other night suggested a shift in eye relief but not in a consistant way. It realy needs to be measured, I have done that before but it's a bit tricky if you want to be exact. I wish someone could find an optical explanation for the shift in eye relief.
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