henry link
Well-known member
James,
At the time these Rangemasters were made the Japanese optical industry standards allowed the use of the term "fully coated" only on binoculars in which all optical surfaces were coated with the single layer coatings that were available then. "Coated optics" could be used on binoculars even if only one surface in the instrument was coated. Each uncoated surface would subtract about 3-4% transmission compared to the same surface with a single layer coating.
I would say that the image in old binoculars with single layer coatings, not to mention those with some uncoated surfaces, looks pretty dim and lifeless compared to most of the fully multi-coated binoculars of the last 25-30 years, even in bright sunlight.
Henry
At the time these Rangemasters were made the Japanese optical industry standards allowed the use of the term "fully coated" only on binoculars in which all optical surfaces were coated with the single layer coatings that were available then. "Coated optics" could be used on binoculars even if only one surface in the instrument was coated. Each uncoated surface would subtract about 3-4% transmission compared to the same surface with a single layer coating.
I would say that the image in old binoculars with single layer coatings, not to mention those with some uncoated surfaces, looks pretty dim and lifeless compared to most of the fully multi-coated binoculars of the last 25-30 years, even in bright sunlight.
Henry
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