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Message: <blockquote data-quote="Renze de Vries" data-source="post: 1514125" data-attributes="member: 10024">That's what history has in store for you when you don't have a driver's license, you don't own a car, you're stuck with a bike and your tyres go flat all the time.The most important thing I learned from the eyecup experiments is, that the eyecup's size and shape is not only of consequence to how the binocular is 'felt', i.e. more or less comfortable, but that it's also of crucial importance to the binocular's performance. For instance, if an eyecup's diameter is too large the binocular will have a tendency to 'get stuck' in the eyesockets with the result that the Apparent Field of View will be perceived as rather small, closed in. A rigid fit creates a small (perceived) view. Or: apparently there has to be some kind of looseness in the binocular-eye interface which can be quite critical.Renze</blockquote>