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Binoculars & Spotting Scopes
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Flat Field technology: the hows, the why's, the consequences
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<blockquote data-quote="OPTIC_NUT" data-source="post: 3160972" data-attributes="member: 121951"><p>It all seems quite relative to me.</p><p>There were apochromats long before the ED psuedo-apochromats.</p><p>Nagler EPs predate all this history being fussed over, and they are far flatter and wider than </p><p> the so-called "flat-field" technology, which is one or two aspheric lenses in a sexy marketing dress.</p><p></p><p>You gotta hand it to Nikon, though: the whole Japanese optical industry was swept by</p><p>the Asahi "amber" coatings at the same time (same Asahi/Zeiss project and patents) but lost the</p><p>marketing/sexiness boat to the Germans. Zeiss actually imported Asahi-coated lenses for a while.</p><p>But....Nikon wowed the crowd by putting aspherics into binoculars, which actually save money </p><p>over adding a bunch more meniscus elements, and calling it 'field flattening'. It does a lot if you</p><p>already have many elements. It does just a little better with EPs in the Aculon line with fewer elements.</p><p></p><p>Someday I hope to figure out how to demonstrate some of the oldies I have </p><p>were done with a parabolic grind. They do have the best resolution I've seen.</p></blockquote><p></p>
[QUOTE="OPTIC_NUT, post: 3160972, member: 121951"] It all seems quite relative to me. There were apochromats long before the ED psuedo-apochromats. Nagler EPs predate all this history being fussed over, and they are far flatter and wider than the so-called "flat-field" technology, which is one or two aspheric lenses in a sexy marketing dress. You gotta hand it to Nikon, though: the whole Japanese optical industry was swept by the Asahi "amber" coatings at the same time (same Asahi/Zeiss project and patents) but lost the marketing/sexiness boat to the Germans. Zeiss actually imported Asahi-coated lenses for a while. But....Nikon wowed the crowd by putting aspherics into binoculars, which actually save money over adding a bunch more meniscus elements, and calling it 'field flattening'. It does a lot if you already have many elements. It does just a little better with EPs in the Aculon line with fewer elements. Someday I hope to figure out how to demonstrate some of the oldies I have were done with a parabolic grind. They do have the best resolution I've seen. [/QUOTE]
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Flat Field technology: the hows, the why's, the consequences
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