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  1. H

    How much blackout do you tolerate in binoculars ?

    Bruce, I wouldn't delete anything. A thread like this is useful. Ed's earlier statements about vignetting are quite confusing until you realize they're mistaken. Henry
  2. H

    How much blackout do you tolerate in binoculars ?

    I only read the first link. It’s a good example of the kind of thing Ed wrote about binocular vignetting before he recognized his mistake. In that piece he writes about the vignetted aperture he sees at the back of a binocular when sighting through the objective as the “exit pupil”. In fact, it...
  3. H

    How much blackout do you tolerate in binoculars ?

    Brock, The original misconception about this, which you can still read in Ed’s first threads on the subject, was the notion that vignetting in binoculars reduced illumination of “the exit pupil”, as if there is only one exit pupil for the entire image field. In fact there is an infinite number...
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