Re: Binocular Question

From: Bjoern Gimle (bjorn.gimle@tietotech.se)
Date: Thu Apr 12 2001 - 05:13:11 PDT

  • Next message: Tony Beresford: "Re: Predictions"

    I would say Exit pupil = Objective diameter / Magnification
    
    , which makes   Relative Brightness Index = square of ( objective diameter /
    magnification).
    
    
    
    > For satellite observation (and general astronomy
    > observation) I've been using the "Relative Brightness
    > Index" as the measure for rating a binocular's ability
    > to gather light.  This index is defined as the exit
    > pupil diameter divided by the magnification and
    > multiplied by the objective diameter.
    >
    > For 7x50s the index is 51
    > For 10x50s the index is 25
    > For 12x50s the index is 17
    > For 7x35s the index is 25
    > For 20x60s the index is 9
    >
    
    
    
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