Re: Binoculars w/reduced effective apertures
From: anton jopko (jopkoam_at_mcmaster.ca)
Date: 01/21/05
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Date: Fri, 21 Jan 2005 13:00:11 -0500
Dear Ed,
I would just add that the vernier for measuring the diameter of the exit
pupil should be located at the eye relief position to obtain the correct
value. Too close to the eyepiece gives too big a diameter and too far from
the eyepiece gives too small an answer.
you can point the binoculars at a bright sky ( not the sun) and see where
the bright spot (seen on a piece of paper for example) behind the eyepiece
is the smallest. This is the eye relief position.
Best Wishes,
anton
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