{"version":"1.0","provider_name":"bokehsommelier","provider_url":"https:\/\/bokehsommelier.com","title":"Ernst Gundlach and the American Lens Design That Preceded the Sonnar by Four Decades - bokehsommelier","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"ucTRB7eiHW\"><a href=\"https:\/\/bokehsommelier.com\/index.php\/2026\/04\/08\/ernst-gundlach-american-optics-sonnar-predecessor\/\">Ernst Gundlach and the American Lens Design That Preceded the Sonnar by Four Decades<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/bokehsommelier.com\/index.php\/2026\/04\/08\/ernst-gundlach-american-optics-sonnar-predecessor\/embed\/#?secret=ucTRB7eiHW\" width=\"600\" height=\"338\" title=\"&#8220;Ernst Gundlach and the American Lens Design That Preceded the Sonnar by Four Decades&#8221; &#8212; bokehsommelier\" data-secret=\"ucTRB7eiHW\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/bokehsommelier.com\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"I feel like generally American manufacturers don\u2019t get their due credit when it comes to their inventions in the world of optics. The idea behind Ludwig Bertele\u2019s Sonnar was to reduce glare and loss of contrast while increasing transmission by incorporating fewer air-to-glass surfaces, although this was a concept that wasn\u2019t exactly invented by him. [&hellip;]"}