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id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">British optical company</div> <p><b>Ross</b> is the name of a succession of <a href="/wiki/London" title="London">London</a>-based lens designers and their company. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Ross_Extra_Rapid_8x5_lens.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Ross_Extra_Rapid_8x5_lens.jpg/220px-Ross_Extra_Rapid_8x5_lens.jpg" decoding="async" width="220" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Ross_Extra_Rapid_8x5_lens.jpg/330px-Ross_Extra_Rapid_8x5_lens.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Ross_Extra_Rapid_8x5_lens.jpg/440px-Ross_Extra_Rapid_8x5_lens.jpg 2x" data-file-width="1600" data-file-height="1236" /></a><figcaption>Ross Extra Rapid 8x5 lens of about 1880</figcaption></figure> <p>Andrew Ross (1798–1859) founded his company in 1830; from 1840 he began producing camera lenses signed "A. Ross". During his lifetime, the company was one of the foremost lens manufacturers. The year after his death in 1859, his son-in-law <a href="/wiki/John_Henry_Dallmeyer" title="John Henry Dallmeyer">John Henry Dallmeyer</a> left the firm to establish his own optical company and the company was run by Ross's son, Thomas, and became known as Ross & Co. By the 1890s it was also making Zeiss and Goerz lenses under licence for sale in the UK and the British Empire. Ross patented a wide-angle lens design and Zeiss took this further to produce their EWA Protars. Before World War 1, Ross and Zeiss worked quite closely together, but at the outbreak of War the British Government put Ross in control of the newly opened Carl Zeiss binocular and optical factory in Mill Hill, London. </p><p>A 1902 Ross advertisement includes: </p> <ul><li>Ross Symmetrical Anastigmats</li> <li>Zeiss New Planar and Unar lenses</li> <li>Zeiss Convertible Anastigmats</li> <li>Goerz Double Anastigmats</li></ul> <p>Ross also made some cameras from about 1855 to the late 1930s. A range of Ross Standard Reflex cameras is listed with an illustration in the 1935 British Journal Photographic Almanac, the sizes ranged from <style data-mw-deduplicate="TemplateStyles:r1154941027">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="frac">3<span class="sr-only">+</span><span class="num">1</span>⁄<span class="den">2</span></span> by <span class="frac">2<span class="sr-only">+</span><span class="num">1</span>⁄<span class="den">2</span></span> inches (89 mm × 64 mm) up to half plate.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Manual_of_Style/Dates_and_numbers" title="Wikipedia:Manual of Style/Dates and numbers"><span title="This term requires quantification. (May 2021)">quantify</span></a></i>]</sup> </p><p>During WWI and WWII Ross Limited produced pattern 373 and 373B "Officer of the Watch" telescopes for the Royal Navy. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Ross_pattern_373B_Royal_Navy_Officer_of_the_Watch_telescope_engraving.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/f/f1/Ross_pattern_373B_Royal_Navy_Officer_of_the_Watch_telescope_engraving.png" decoding="async" width="146" height="99" class="mw-file-element" data-file-width="146" data-file-height="99" /></a><figcaption>Ross pattern 373B single-draw Royal Navy Officer of the Watch telescope engraving</figcaption></figure> <p>In the mid-20th century, Ross continued to produce lenses, as well as binoculars, epidiascopes, etc. They had begun supplying lenses for Ensign cameras in the 1930s. After World War II Ross merged with Barnet Ensign, and the company later became Ross Ensign, lenses were also made for other companies such as <a href="/wiki/Micro_Precision_Products" title="Micro Precision Products">MPP</a>. </p><p> Ross was taken over by <a href="/w/index.php?title=Avimo&action=edit&redlink=1" class="new" title="Avimo (page does not exist)">Avimo</a> in 1975; Avimo was later taken over by <a href="/wiki/Thales_Group" title="Thales Group">Thales</a> Optics.</p><ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Ross_wide-angle_surveillance_lens_side_view.jpg" class="mw-file-description" title="A Ross wide-angle lens mounted in an aerial surveillance camera, Swedish Air Force Museum, Linköping."><img alt="A Ross wide-angle lens mounted in an aerial surveillance camera, Swedish Air Force Museum, Linköping." src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Ross_wide-angle_surveillance_lens_side_view.jpg/120px-Ross_wide-angle_surveillance_lens_side_view.jpg" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Ross_wide-angle_surveillance_lens_side_view.jpg/180px-Ross_wide-angle_surveillance_lens_side_view.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Ross_wide-angle_surveillance_lens_side_view.jpg/240px-Ross_wide-angle_surveillance_lens_side_view.jpg 2x" data-file-width="1280" data-file-height="1280" /></a></span></div> <div class="gallerytext">A Ross wide-angle lens mounted in an <a href="/wiki/Aerial_photography" title="Aerial photography">aerial surveillance camera</a>, <a href="/wiki/Swedish_Air_Force_Museum" title="Swedish Air Force Museum">Swedish Air Force Museum</a>, <a href="/wiki/Link%C3%B6ping" title="Linköping">Linköping</a>.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Ross_wide-angle_surveillance_lens_closeup_view.jpg" class="mw-file-description" title="Close-up of the Ross wide-angle lens."><img alt="Close-up of the Ross wide-angle lens." src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Ross_wide-angle_surveillance_lens_closeup_view.jpg/120px-Ross_wide-angle_surveillance_lens_closeup_view.jpg" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Ross_wide-angle_surveillance_lens_closeup_view.jpg/180px-Ross_wide-angle_surveillance_lens_closeup_view.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Ross_wide-angle_surveillance_lens_closeup_view.jpg/240px-Ross_wide-angle_surveillance_lens_closeup_view.jpg 2x" data-file-width="1280" data-file-height="1280" /></a></span></div> <div class="gallerytext">Close-up of the Ross wide-angle lens.</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="Sources">Sources</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ross_(optics)&action=edit&section=1" title="Edit section: Sources"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Wilkinson, Matthew, and Colin Glanfield. <i>A lens collector's vade mecum.</i> (CD publication) "Version 7/5/2001" (7 May 2001).</li> <li><i>British Journal Photographic Almanac 1935</i>, Henry Greenwood & Co 1935</li></ul> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Ross_of_london.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/8/85/Ross_of_london.jpg" decoding="async" width="109" height="85" class="mw-file-element" data-file-width="109" data-file-height="85" /></a><figcaption>Ross logo</figcaption></figure>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; 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