Quality scopes have coated lenses, which can be recognized by tipping the glass until you see a purple, blue, or even yellow reflection.
Both sides of each lens are coated with a metallic fluoride so thin that it is measured in millionths of an inch and applied microscopically with an ion gun. This coating, which reduces reflection, enhances the passage of light and thus significantly improves how much we can see when looking through it.
Prior to the development of optical glass coating techniques—perfected by Zeiss during the 1930s—each lens that light passed through would reflect a bit, perhaps up to 5 percent. If, as in the case of a modern zoom scope, the light had to pass through eight lenses, the final image that reached your eye could have lost 40 percent of its original brilliance.
But quality molecular coatings—especially multicoatings—reduce reflection to as little as 1 percent per lens, a difference so dramatic that you can recognize it instantly if you compare a coated and uncoated scope side by side.
Multiple coatings done under rigidly controlled quality control are not cheap. It's one reason that the very best scopes may cost much more than similar scopes of even identical magnification and objective lens size.
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Deer hunting is an interesting thing that reminds you of those golden old ages of 19th centuries, where a handsome hunk well equipped with all hunting material rides on horse searching for his target animal either for the purpose of displaying his masculine powers or for enticing and wooing his lady love.