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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: 3166483" data-attributes="member: 121951"><p>OK....time to put it all together.</p><p></p><p>Some optical engineering history:</p><p></p><p><a href="http://www.brayebrookobservatory.org/BrayObsWebSite/HOMEPAGE/forum/Smyth-Barlow%20lenses.html" target="_blank">http://www.brayebrookobservatory.org/BrayObsWebSite/HOMEPAGE/forum/Smyth-Barlow lenses.html</a></p><p></p><p>The first field flattener in refractive use came from the Scotsman Charles Piazzi Smyth in 1873. </p><p>In 1911, Moritz von Rohr applied it to a Zeiss camera lens.</p><p>In 1944, Albert König used a Smyth field flattener in a U-Boat periscope.</p><p></p><p>The Kohler eyepiece (1959), predcessor to the Nagler, has this flattening technology.</p><p>Figure 37-55 shows the flattening effects on spherical aberration, astigmatism, and (shape) distortion.</p><p>Both the Kohler and the Nagler can be said to have 'field flattening technology'.</p><p>That is their main hallmark.</p><p></p><p>Finally:</p><p></p><p>A. Tronnier of Schneider Kreuznach, actually applied field flattening technology to </p><p>Ww-2 observation binoculars....an Erfle, a wedge, and the Smyth flattener.</p><p></p><p>You can find a Smyth / pseudo-Barlow flattener in early Bushnell Custom Compacts.</p><p>This predates flattening technology in most non-military binoculars.</p><p></p><p>So the very first use of all time was with a Scotsman long ago,</p><p>the first in binoculars was a German in WW2,</p><p>and the first consumer binoculars would be sometime in the 1950s-60s, produced in Japan for Bushnell.</p><p>(that I know of)</p></blockquote><p></p>
[QUOTE="OPTIC_NUT, post: 3166483, member: 121951"] OK....time to put it all together. Some optical engineering history: [url]http://www.brayebrookobservatory.org/BrayObsWebSite/HOMEPAGE/forum/Smyth-Barlow%20lenses.html[/url] The first field flattener in refractive use came from the Scotsman Charles Piazzi Smyth in 1873. In 1911, Moritz von Rohr applied it to a Zeiss camera lens. In 1944, Albert König used a Smyth field flattener in a U-Boat periscope. The Kohler eyepiece (1959), predcessor to the Nagler, has this flattening technology. Figure 37-55 shows the flattening effects on spherical aberration, astigmatism, and (shape) distortion. Both the Kohler and the Nagler can be said to have 'field flattening technology'. That is their main hallmark. Finally: A. Tronnier of Schneider Kreuznach, actually applied field flattening technology to Ww-2 observation binoculars....an Erfle, a wedge, and the Smyth flattener. You can find a Smyth / pseudo-Barlow flattener in early Bushnell Custom Compacts. This predates flattening technology in most non-military binoculars. So the very first use of all time was with a Scotsman long ago, the first in binoculars was a German in WW2, and the first consumer binoculars would be sometime in the 1950s-60s, produced in Japan for Bushnell. (that I know of) [/QUOTE]
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