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Message: <blockquote data-quote="henry link" data-source="post: 3648643" data-attributes="member: 6806">I was around in the days before p-coating. My memory is that very few people realized they were sacrificing any  optical quality at all when they bought a high priced Leitz or Zeiss roof. Magazine reviewers used the same superlatives to describe the image quality of roof prism binoculars then as now."Looking through these binoculars is like having a little light bulb illuminate a perfect image". That's a quote describing the #1 rated Zeiss 7x42 Dialyt from a Cornell Lab "Living Bird Quarterly" group test of binoculars in 1988. It wasn't that the testers lacked Porros for comparison. That test contained some noteworthy Porros, like the Swift Audubon and the CZJ Octarem, which appear well down on the list below a number of forgettable roofs. The testers "saw" what they expected to see, based on price, brand prestige and probably group think.</blockquote>