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Message: <blockquote data-quote="WJC" data-source="post: 3618984" data-attributes="member: 25191">And from the vignette #6:An observer might grab his binocular to see who just drove slowly past his house. He doesn’t notice the burgundy car looks black with a yellow/green fringe on one side, that the image starts getting soft 1/3rd of the way from the center of the field, or that the binocular is so poorly collimated he has to use the limits of his spatial accommodation to achieve even a barely tolerable image. That poor quality binocular told him what he wanted to know; thus, his needs were met. Would he have noticed the difference had he been using a Swarovski or Leica? Probably not. Physics never takes a back seat to opinion. But it’s opinion, not physics, that makes cash registers ring. :cat:</blockquote>