{"id":11851,"date":"2025-10-23T18:53:18","date_gmt":"2025-10-23T18:53:18","guid":{"rendered":"https:\/\/blog.tract-optics.co.za\/light-transmission-myth-why-bigger-tubes-dont-mean-brighter-views\/"},"modified":"2025-10-28T14:51:48","modified_gmt":"2025-10-28T14:51:48","slug":"light-transmission-myth-why-bigger-tubes-dont-mean-brighter-views","status":"publish","type":"post","link":"https:\/\/blog.tract-optics.co.za\/light-transmission-myth-why-bigger-tubes-dont-mean-brighter-views\/","title":{"rendered":"Light Transmission Myth: Why Bigger Tubes Don\u2019t Mean Brighter Views"},"content":{"rendered":"<p><span style=\"color: #1a1c1e; font-family: 'Noto Serif', Georgia, serif; font-size: 2.6rem; font-weight: bold;\">Light Transmission Myth: Why Bigger Tubes Don\u2019t Mean Brighter Views<\/span><\/p><p><iframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/zWTsJUeku0I?si=IlB3yEpO45Cz_2GU\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p><p>When choosing a <a href=\"https:\/\/blog.tract-optics.co.za\/videosview\/why-james-eagleman-prefers-moa\/\">rifle scope<\/a>, especially for low-light hunting or <a href=\"https:\/\/blog.tract-optics.co.za\/videosview\/shooting-tight-groups\/\">precision shooting<\/a>, it\u2019s easy to get caught up in specs like tube diameter. But here\u2019s the truth: the size of the tube doesn\u2019t determine how bright your image will be.<\/p><p>Let\u2019s break down two often-confused concepts\u2014<strong>light transmission<\/strong> and <strong>light gathering<\/strong>\u2014and show you what actually affects performance in the field.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\"><div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p><span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.tract-optics.co.za\/light-transmission-myth-why-bigger-tubes-dont-mean-brighter-views\/#Light_Transmission_Its_Not_About_Tube_Size\" >Light Transmission: It\u2019s Not About Tube Size<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.tract-optics.co.za\/light-transmission-myth-why-bigger-tubes-dont-mean-brighter-views\/#Light_Gathering_Where_Objective_Size_and_Magnification_Matter\" >Light Gathering: Where Objective Size and Magnification Matter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.tract-optics.co.za\/light-transmission-myth-why-bigger-tubes-dont-mean-brighter-views\/#What_This_Means_for_You\" >What This Means for You<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.tract-optics.co.za\/light-transmission-myth-why-bigger-tubes-dont-mean-brighter-views\/#Explore_the_Full_Line_of_TORIC_Rifle_Scopes\" >Explore the Full Line of TORIC Rifle Scopes<\/a><\/li><\/ul><\/nav><\/div><h3><span class=\"ez-toc-section\" id=\"Light_Transmission_Its_Not_About_Tube_Size\"><\/span>Light Transmission: It\u2019s Not About Tube Size<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Let me ask you a question:<br \/>Which of these three <a href=\"https:\/\/blog.tract-optics.co.za\/best-optic-for-a-predator-rifle\/\">scopes<\/a> delivers the best light transmission?<\/p><ul><li><a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-1inch-hunting-rifle-scopes\" target=\"_blank\" rel=\"noopener\">TORIC 1-inch<\/a><\/li><li><a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-30mm-long-range-rifle-scopes\" target=\"_blank\" rel=\"noopener\">TORIC 30mm<\/a><\/li><li><a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-34mm-elr-rifle-scopes\" target=\"_blank\" rel=\"noopener\">TORIC 34mm<\/a><\/li><\/ul><p><span style=\"color: #ff6600;\">The answer? <strong>They all deliver the same<\/strong>.<\/span> That&#8217;s becuase they all feature SCHOTT HT Glass, ED lens and our advanced multi-coated optical system. Watch the <strong>Part 2<\/strong> video below to learn more&#8230;<\/p><p><iframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/hbNsRL8IICE?si=xju0dq5nyvtTcpD-\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p><p>Light transmission is all about the <strong>quality of the glass<\/strong> and the <strong>lens coatings<\/strong>\u2014not the tube diameter. Whether it\u2019s a 1-inch or 34mm tube, the amount of light that passes through the scope from objective to eyepiece depends on:<\/p><ul><li><strong>Precision-ground optical glass <\/strong>for superior light transmission<\/li><li><strong>Advanced multi-layer coatings<\/strong> that reduce glare and maximize clarity<\/li><li><strong>Internal lens alignment and construction<\/strong><\/li><\/ul><p>A larger tube may offer more adjustment range, but it doesn\u2019t make your image brighter.<\/p><p><span style=\"color: #ff6600;\"><strong>PRO TIP:<\/strong><\/span> By increasing the size of the objective lens, the &#8220;sweet spot&#8221; (which is the center of a lens) will increase. Therefore, providing better resolution and detail which will make the image appear brighter.<\/p><h3><span class=\"ez-toc-section\" id=\"Light_Gathering_Where_Objective_Size_and_Magnification_Matter\"><\/span>Light Gathering: Where Objective Size and Magnification Matter<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Now let\u2019s talk about <strong>light gathering<\/strong>, which is often misunderstood.<\/p><p>Light gathering refers to how much light your eye can access through the scope\u2014especially in low-light conditions. This is determined by the <strong>exit pupil<\/strong>, which is calculated by dividing the objective lens diameter by the <a href=\"https:\/\/blog.tract-optics.co.za\/tract-toric-30mm-1-8x24-lpvo-throw-lever-installation\/\">magnification<\/a>.<\/p><p>Let\u2019s look at three <a href=\"https:\/\/tractoptics.com\/riflescopes\" target=\"_blank\" rel=\"noopener\">TORIC scopes<\/a>, all set at 10x magnification:<\/p><table><thead><tr><th>Scope<\/th><th>Objective Size<\/th><th>Tube Diameter<\/th><th>Exit Pupil<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-1inch-hunting-rifle-scopes\" target=\"_blank\" rel=\"noopener\">TORIC 3-15&#215;50 (1-inch)<\/a><\/td><td>50mm<\/td><td>1 inch<\/td><td>5.0mm<\/td><\/tr><tr><td><a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-30mm-long-range-rifle-scopes\" target=\"_blank\" rel=\"noopener\">TORIC 4-20&#215;50 (30mm)<\/a><\/td><td>50mm<\/td><td>30mm<\/td><td>5.0mm<\/td><\/tr><tr><td><a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-34mm-elr-rifle-scopes\" target=\"_blank\" rel=\"noopener\">TORIC 4.5-30&#215;56 (34mm)<\/a><\/td><td>56mm<\/td><td>34mm<\/td><td>5.6mm<\/td><\/tr><\/tbody><\/table><p><span style=\"color: #ff6600;\"><strong>Notice something? The<\/strong> <strong>exit pupil increases with a larger objective lens<\/strong><\/span>\u2014not with a larger tube. That 5.6mm exit pupil on the 34mm scope gives your eye slightly more light access in dim conditions, but it\u2019s due to the <a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-34mm-elr-rifle-scopes\" target=\"_blank\" rel=\"noopener\">56mm objective<\/a>\u2014not the tube diameter.<\/p><figure id=\"attachment_9081\" aria-describedby=\"caption-attachment-9081\" style=\"width: 672px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-34mm-elr-rifle-scopes\" target=\"_blank\" rel=\"noopener\"><img fetchpriority=\"high\" decoding=\"async\" class=\" wp-image-9081\" src=\"http:\/\/blog.tractoptics.com\/wp-content\/uploads\/2025\/10\/Tract-Optics-Digital_970x250_144-1024x264.png\" alt=\"Light Transmission Myth: Why Bigger Tubes Don\u2019t Mean Brighter Views\" width=\"672\" height=\"173\" title=\"\"><\/a><figcaption id=\"caption-attachment-9081\" class=\"wp-caption-text\">Light Transmission Myth: Why Bigger Tubes Don\u2019t Mean Brighter Views<\/figcaption><\/figure><h3><span class=\"ez-toc-section\" id=\"What_This_Means_for_You\"><\/span><span style=\"color: #ff6600;\">What This Means for You<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3><p>If you\u2019re <a href=\"https:\/\/blog.tract-optics.co.za\/what-to-pair-with-the-best-binoculars-for-hunting-out-west\/\">glassing<\/a> at dawn, tracking game at dusk, or shooting in shaded terrain, here\u2019s what to focus on:<\/p><ul><li>Choose scopes with <strong>larger objective lenses<\/strong> for better light gathering<\/li><li>Prioritize <strong>high-transmission glass like <a href=\"https:\/\/tractoptics.com\/videosview\/why-weve-used-schott-ht-glass\/\" target=\"_blank\" rel=\"noopener\">SCHOTT HT <\/a><\/strong>found in all <a title=\"TORIC scopes\" href=\"https:\/\/blog.tractoptics.com\/videosview\/how-to-install-the-zero-stop\/\" target=\"_blank\" rel=\"noopener\">TORIC scopes<\/a>\u00a0for superior light transmission<\/li><li>Don\u2019t assume a bigger tube means a brighter image\u2014it doesn\u2019t<\/li><\/ul><p>All three TORIC scopes mentioned above are excellent long range options. The right choice depends on the desired weight of your set-up, adjustment range, and low-light preferences\u2014not the myth of tube diameter brightness.<\/p><p style=\"text-align: center;\"><a style=\"text-align: center; text-decoration: none;\" href=\"https:\/\/www.trustpilot.com\/review\/tractoptics.com?utm_medium=Trustbox&amp;utm_source=EmailNewsletter3\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"alignleft\" src=\"https:\/\/emailsignature.trustpilot.com\/newsletter\/en-US\/3\/5fc7afaa58a6e200016f0dfc\/520\/170\/light@2x.png?stars=5,4,3,2,1&amp;fontSize=default\" alt=\"\" width=\"520\" height=\"170\" border=\"0\" title=\"\"><\/a><\/p><h3><\/h3><h3><span class=\"ez-toc-section\" id=\"Explore_the_Full_Line_of_TORIC_Rifle_Scopes\"><\/span>Explore the Full Line of TORIC Rifle Scopes<span class=\"ez-toc-section-end\"><\/span><\/h3><p><a href=\"https:\/\/tractoptics.com\/\" target=\"_blank\" rel=\"noopener\"><strong>At TRACT<\/strong><\/a>, we design scopes with purpose\u2014balancing optical performance, rugged construction, and real-world utility. Whether you\u2019re running a lightweight <a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-1inch-hunting-rifle-scopes\" target=\"_blank\" rel=\"noopener\">1-inch tube<\/a> a <a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-30mm-long-range-rifle-scopes\" target=\"_blank\" rel=\"noopener\">30mm long range model<\/a> or a <a href=\"https:\/\/tractoptics.com\/riflescopes\/toric-34mm-elr-rifle-scopes\" target=\"_blank\" rel=\"noopener\">34mm beast<\/a>, you\u2019re getting elite performance where it counts.<\/p><p><span style=\"color: #ff6600;\"><strong><a style=\"color: #ff6600;\" href=\"https:\/\/tractoptics.com\/riflescopes\" target=\"_blank\" rel=\"noopener\">See the full line of TORIC Rifle Scopes at TRACToptics.com<\/a><\/strong><\/span><\/p><p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Light Transmission Myth: Why Bigger Tubes Don\u2019t Mean Brighter Views. When choosing a rifle scope, especially for low-light hunting or precision shooting, it\u2019s easy to get caught up in specs like tube diameter. But here\u2019s the truth: the size of the tube doesn\u2019t determine how bright your image will be.<\/p>\n","protected":false},"author":2,"featured_media":11863,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2265],"tags":[3677,3678,3679,3483,3680],"class_list":["post-11851","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rifle-scope","tag-best-30mm-scope-for-hunting","tag-best-34mm-scope","tag-best-light-weight-scope","tag-best-scope-for-hunting","tag-best-scope-for-low-light"],"_links":{"self":[{"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/posts\/11851","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/comments?post=11851"}],"version-history":[{"count":3,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/posts\/11851\/revisions"}],"predecessor-version":[{"id":12346,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/posts\/11851\/revisions\/12346"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/media\/11863"}],"wp:attachment":[{"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/media?parent=11851"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/categories?post=11851"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/tags?post=11851"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}