{"id":558,"date":"2020-02-25T15:17:15","date_gmt":"2020-02-25T15:17:15","guid":{"rendered":"https:\/\/tractoptics.com\/blog\/?p=558"},"modified":"2026-05-21T11:37:22","modified_gmt":"2026-05-21T11:37:22","slug":"toric-10x50-binocular-the-low-light-leader","status":"publish","type":"post","link":"https:\/\/blog.tract-optics.co.za\/toric-10x50-binocular-the-low-light-leader\/","title":{"rendered":"TORIC 10&#215;50 Binocular &#8211; The Low Light Leader"},"content":{"rendered":"<p>In this article we will uncover the true benefits of the <a href=\"https:\/\/tractoptics.com\/10x50-binoculars\" target=\"_blank\" rel=\"noopener\">TORIC 10&#215;50 Binocular<\/a> and why it may be the best low light <a href=\"https:\/\/blog.tract-optics.co.za\/understanding-turkey-behavior\/\">binocular<\/a>. Before we do that, let\u2019s ask the question of <strong>WHY<\/strong> did the <a href=\"https:\/\/tractoptics.com\/10x42-binoculars\" target=\"_blank\" rel=\"noopener\">TORIC 10&#215;42 Binocular<\/a> become the go-to optic for the majority of the <a href=\"https:\/\/blog.tract-optics.co.za\/binoculars-for-turkey-hunting\/\">hunting<\/a> community?<\/p><p><strong># 1\u00a0<\/strong> \u2013 With optical quality like the <a href=\"https:\/\/blog.tract-optics.co.za\/setting-up-your-tract-optics-bino-chest-pak\/\">TORIC<\/a> 10&#215;42 a given, it has the ideal size, weight and magnification balance for almost any <a class=\"wpil_keyword_link\" href=\"https:\/\/tractoptics.com\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" title=\"hunting\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"973\">hunting<\/a> situation.<br \/><strong>#2<\/strong> \u2013 Because everybody else has one.<\/p><p>But, can you do better for your specific hunting needs? Here are some true <a href=\"https:\/\/blog.tractoptics.com\/videosview\/toric-34mm-4-25x50-long-range-rifle-scope-features-and-benefits\/\" title=\"TORIC 34MM 4-25X50 Long Range rifle scope features and benefits\" data-wpil-monitor-id=\"1633\" target=\"_blank\" rel=\"noopener\">benefits a 10&#215;50 binocular<\/a> would have over the ever popular 10&#215;42:<\/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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.tract-optics.co.za\/toric-10x50-binocular-the-low-light-leader\/#More_Light_Means_More_Intel\" >More Light Means More Intel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.tract-optics.co.za\/toric-10x50-binocular-the-low-light-leader\/#Measured_Performance_of_the_10x50_Binocular\" >Measured Performance of the 10x50 Binocular<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.tract-optics.co.za\/toric-10x50-binocular-the-low-light-leader\/#Larger_Exit_Pupil_Makes_it_Easier_to_Use\" >Larger Exit Pupil Makes it Easier to Use<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.tract-optics.co.za\/toric-10x50-binocular-the-low-light-leader\/#Main_Advantages_of_TORIC_10x42_Binocular\" >Main Advantages of TORIC 10x42 Binocular<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.tract-optics.co.za\/toric-10x50-binocular-the-low-light-leader\/#The_Best_Low_Light_Binocular\" >The Best Low Light Binocular<\/a><\/li><\/ul><\/nav><\/div><h2><span class=\"ez-toc-section\" id=\"More_Light_Means_More_Intel\"><\/span>More Light Means More Intel<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Like a large bay window that lets in more-light to your house versus a small standard window, the larger objective lens of the binocular has the potential to let in more light to your eye. More light means that you can see more detail\u2026Additional Intel to make better hunting decisions! The exit pupil of a binocular (the white circles you see when holding the binocular out at arms-length) is the same as that window illustration. A <a href=\"https:\/\/tractoptics.com\/10x50-binoculars\" target=\"_blank\" rel=\"noopener\">10&#215;50 Binoculars<\/a> \u201cwindow of light\u201d is 5mm vs a 4.2mm exit pupil in a 10&#215;42.<\/p><p>Magnification Divided by The Diameter of the Objective\u00a0 = Exit Pupil Size<\/p><p>&nbsp;<\/p><p><img fetchpriority=\"high\" decoding=\"async\" title=\"TORIC 10x50 Binocular - The Low Light Leader\" class=\"alignnone wp-image-574\" src=\"https:\/\/blog.tractoptics.com\/wp-content\/uploads\/2020\/02\/Exit-Pupil-Comparison-final-300x171.png\" alt=\"TORIC 10x50 Binocular - The Low Light Leader\" width=\"480\" height=\"273\" srcset=\"https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/Exit-Pupil-Comparison-final-300x171.png 300w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/Exit-Pupil-Comparison-final-1024x585.png 1024w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/Exit-Pupil-Comparison-final-768x439.png 768w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/Exit-Pupil-Comparison-final-525x300.png 525w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/Exit-Pupil-Comparison-final-150x86.png 150w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/Exit-Pupil-Comparison-final.png 1050w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/p><h2><\/h2><h2>Measured Performance of the 10&#215;50 Binocular<\/h2><p>By utilizing other optical performance calculations like Relative Brightness &#038; Twilight Factor, it will help tell the story of why a 10&#215;50 Binocular may be the better choice.<\/p><p><strong>Relative Brightness or Brightness Index<\/strong><br \/>To get this performance number, you \u201cSquare the diameter of the exit pupil.\u201d So, a <a href=\"https:\/\/tractoptics.com\/10x42-binoculars\" target=\"_blank\" rel=\"noopener\">10&#215;42 Binocular<\/a> which has an Exit Pupil of 4.2 (Magnification divided by Objective) and a 10&#215;50 would have an exit pupil of 5 the calculation would be as follows:<\/p><p><strong>\u2022 4.2 squared = 17.64<\/strong><br \/><strong>\u2022 5 squared = 25<\/strong><\/p><p>The <a href=\"https:\/\/tractoptics.com\/10x50-binoculars\" target=\"_blank\" rel=\"noopener\">10&#215;50 Binocular<\/a> has a 30% improvement in Relative Brightness over a 10&#215;42 Binocular<\/p><p><strong>Twilight Factor Benefit<\/strong><\/p><p>However, twilight factor is a more accurate performance measurement for hunters because it takes into account the size of the objective which will be more noticeable during low light conditions. This is calculated by multiplying the size of objective lens by the magnification of the binocular, then finding the square root of the product. This may offend my math friends, but just forget about the square root part, and do the quick math of multiplying the Magnification X Objective to get a quick useable number.<\/p><p><strong>\u2022 <a href=\"https:\/\/tractoptics.com\/10x42-binoculars\" target=\"_blank\" rel=\"noopener\">10 X 42 Binocular<\/a> = 420<\/strong><br \/><strong>\u2022 <a href=\"https:\/\/tractoptics.com\/10x50-binoculars\" target=\"_blank\" rel=\"noopener\">10 X 50 Binocular<\/a> = 500<\/strong><\/p><p>A <a href=\"https:\/\/tractoptics.com\/10x50-binoculars\" target=\"_blank\" rel=\"noopener\">10&#215;50 Binocular<\/a> has a 16% improvement in Twilight Factor over a 10&#215;42 Binocular<\/p><p>Here\u2019s the bottom line, the larger TF number, the more detail you\u2019ll be able to see in low light. This is why we call the <a href=\"https:\/\/tractoptics.com\/10x50-binoculars\" target=\"_blank\" rel=\"noopener\">TORIC 10&#215;50 Binocular<\/a> the Low Light Leader!<\/p><h2><span class=\"ez-toc-section\" id=\"Larger_Exit_Pupil_Makes_it_Easier_to_Use\"><\/span>Larger Exit Pupil Makes it Easier to Use<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Besides the performance calculations, how is a 5mm exit pupil better than a 4.2mm exit pupil?<br \/>In some situations, it\u2019s almost impossible to keep the binocular steady. You may be exhausted from climbing that ridge and you\u2019re breathing heavy, or you\u2019re just trying to one-hand the bino and holding it in position is difficult. In these cases, a smaller exit pupil is not as forgiving. A 5mm exit pupil allows your eye more room to move. Keeping the blackout around the edges to a minimum, (especially during times of low-light) it\u2019s important to have and exit pupil exceed the size of your entrance pupil.<\/p><p>&nbsp;<\/p><p><iframe src=\"https:\/\/www.youtube.com\/embed\/24OyvBeKr-8\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p><p>In this video, we help explain the relationship between the exit pupil of your optic and the entrance pupil of your eye and why it&#8217;s important for low-light performance.<\/p><h2>Main Advantages of TORIC 10&#215;42 Binocular<\/h2><p>Size &#038; weight is by far the biggest advantage over the 10&#215;50. However, how much bigger is it really?\u00a0 The TORIC 10&#215;50 is 1\u201d taller, \u00bd\u201d wider &#038; approximately 5 oz. heavier than it&#8217;s 10&#215;42 counterpart.\u00a0 Take a look at the picture below for more of a side by side visual:<\/p><p><img decoding=\"async\" title=\"Competitive Rimfire \u2013 A Family Affair\" class=\"alignnone wp-image-576\" src=\"https:\/\/blog.tractoptics.com\/wp-content\/uploads\/2020\/02\/10x50-vs-10x42-final-300x251.png\" alt=\"Competitive Rimfire \u2013 A Family Affair\" width=\"452\" height=\"378\" srcset=\"https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/10x50-vs-10x42-final-300x251.png 300w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/10x50-vs-10x42-final-768x644.png 768w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/10x50-vs-10x42-final-358x300.png 358w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/10x50-vs-10x42-final-150x126.png 150w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/02\/10x50-vs-10x42-final.png 940w\" sizes=\"(max-width: 452px) 100vw, 452px\" \/><\/p><p>In the case of the TORIC line of <a class=\"wpil_keyword_link\" href=\"https:\/\/tractoptics.com\/binoculars\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" title=\"binoculars\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"972\">binoculars<\/a>, the Field Of View is greater in the 10&#215;42. How is it possible that a 42mm lens can have a greater field of view over a 50mm you ask? Because the size of the objective has no relationship to <a href=\"https:\/\/blog.tractoptics.com\/videosview\/tekoas-design\/\" title=\"TEKOA\u2019s Design\" data-wpil-monitor-id=\"1682\" target=\"_blank\" rel=\"noopener\">binoculars FOV\u2026it\u2019s all designed<\/a> in the eyepiece.<\/p><h2><span class=\"ez-toc-section\" id=\"The_Best_Low_Light_Binocular\"><\/span>The Best Low Light Binocular<span class=\"ez-toc-section-end\"><\/span><\/h2><p>So, is the <a href=\"https:\/\/tractoptics.com\/10x50-binoculars\" target=\"_blank\" rel=\"noopener\">10&#215;50 Binocular<\/a> the new <a href=\"https:\/\/tractoptics.com\/10x42-binoculars\" target=\"_blank\" rel=\"noopener\">10&#215;42 Binocular<\/a> for hunters? That\u2019s something only you can determine. It truly depends on your specific hunting needs and requirements. Don\u2019t forget, there is no one binocular that can do it all, you may need multiple binos!\u00a0 To see the full line of TORIC <a href=\"https:\/\/blog.tract-optics.co.za\/tract-toric-2-5-15x44-review1\/\">Binoculars<\/a> visit <a href=\"https:\/\/tractoptics.com\/binoculars\/hunting-binoculars-toric\" target=\"_blank\" rel=\"noopener\">TRACTOptics.com<\/a><\/p><p><strong>Personal Optic Outfitting<\/strong><\/p><p>If you would like help in choosing the right <a href=\"https:\/\/blog.tractoptics.com\/jls-deer-hunting-gear\/\" title=\"JL\u2019s Deer Hunting Gear\" data-wpil-monitor-id=\"1275\" target=\"_blank\" rel=\"noopener\">binocular for your next hunt<\/a> or adventure, please feel free to call, email, or chat with us online at:<\/p><p>Phone: 631-662-7354<\/p><p>Email: support@tractoptics.com<\/p><p>Chat: www.tractoptics.com<\/p><p>&nbsp;<\/p><figure id=\"attachment_1344\" aria-describedby=\"caption-attachment-1344\" style=\"width: 728px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/tractoptics.com\/binoculars\/hunting-binoculars-toric\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" title=\"Coveted 4th Season Mule Deer Tag\" class=\"size-full wp-image-1344\" src=\"https:\/\/blog.tractoptics.com\/wp-content\/uploads\/2020\/12\/TRACT_BRAND_728X90.jpg\" alt=\"Coveted 4th Season Mule Deer Tag\" width=\"728\" height=\"90\" srcset=\"https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/12\/TRACT_BRAND_728X90.jpg 728w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/12\/TRACT_BRAND_728X90-300x37.jpg 300w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/12\/TRACT_BRAND_728X90-600x74.jpg 600w, https:\/\/blog.tract-optics.co.za\/wp-content\/uploads\/sites\/4\/2020\/12\/TRACT_BRAND_728X90-150x19.jpg 150w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/a><figcaption id=\"caption-attachment-1344\" class=\"wp-caption-text\">See The Full Line of <a href=\"https:\/\/blog.tract-optics.co.za\/why-the-toric-12-5x50-binoculars-stand-out\/\">High Performance Binoculars<\/a><\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>TORIC 10&#215;50 Binocular &#8211; The Low Light Leader | TRACT design and engineer performance-grade optics without the added retail costs.<\/p>\n","protected":false},"author":2,"featured_media":12186,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2462,2797,2908],"class_list":["post-558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-binocular","tag-hunting","tag-low-light"],"_links":{"self":[{"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/posts\/558","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=558"}],"version-history":[{"count":1,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/posts\/558\/revisions"}],"predecessor-version":[{"id":11466,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/posts\/558\/revisions\/11466"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/media\/12186"}],"wp:attachment":[{"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/media?parent=558"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/categories?post=558"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.tract-optics.co.za\/wp-json\/wp\/v2\/tags?post=558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}