{"id":796,"date":"2018-02-22T22:28:26","date_gmt":"2018-02-22T22:28:26","guid":{"rendered":"https:\/\/www.1stvision.com\/machine-vision-solutions\/?p=796"},"modified":"2023-07-14T11:35:44","modified_gmt":"2023-07-14T15:35:44","slug":"megapixel-machine-vision-lenses-2","status":"publish","type":"post","link":"https:\/\/www.1stvision.com\/machine-vision-solutions\/2018\/02\/megapixel-machine-vision-lenses-2.html","title":{"rendered":"There is NO such thing as a &#8220;Megapixel&#8221; machine vision camera lens!.. Say what??"},"content":{"rendered":"<p><a href=\"https:\/\/www.1stvision.com\/lens\/machine-vision-lenses\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-800 size-medium\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Megapixel-machine-vision-lenses-300x217.gif\" alt=\"Megapixel Machine vision lenses\" width=\"300\" height=\"217\" \/><\/a>There has been a lot written about the ratings of <a href=\"https:\/\/www.1stvision.com\/lens\/machine-vision-lenses\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #000080;\"><strong>machine vision lenses<\/strong><\/span><\/a>.\u00a0 <a href=\"http:\/\/www.1stvision.com\" target=\"_blank\" rel=\"noopener\">1stVision<\/a> had created<span style=\"color: #000080;\"><strong> <a style=\"color: #000080;\" href=\"https:\/\/www.1stvision.com\/knowledgebase2\/55\/\" target=\"_blank\" rel=\"noopener\">white papers<\/a> <\/strong><\/span>that describe this in detail. <span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;However, the lens industry continues to use the marketing term, Megapixel Machine Vision Camera Lenses.&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:15235,&quot;3&quot;:{&quot;1&quot;:0},&quot;4&quot;:{&quot;1&quot;:2,&quot;2&quot;:15921906},&quot;10&quot;:2,&quot;11&quot;:0,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:0},&quot;15&quot;:&quot;Calibri, sans-serif&quot;,&quot;16&quot;:14}\" data-sheets-textstyleruns=\"{&quot;1&quot;:0}\uee10{&quot;1&quot;:64,&quot;2&quot;:{&quot;2&quot;:{&quot;1&quot;:2,&quot;2&quot;:16711680},&quot;5&quot;:1}}\uee10{&quot;1&quot;:74}\uee10{&quot;1&quot;:89,&quot;2&quot;:{&quot;2&quot;:{&quot;1&quot;:2,&quot;2&quot;:16711680},&quot;5&quot;:1}}\uee10{&quot;1&quot;:102}\">However, the lens industry continues to use the marketing term, Megapixel Machine Vision Camera Lenses.<\/span><\/p>\n<h1><strong>Let\u2019s get this out of the way right now.\u00a0 <\/strong><\/h1>\n<h1><strong>There is NO such thing as a Megapixel Machine vision Camera Lens. <\/strong><\/h1>\n<p>But since it is me against the world, let me explain why sometimes a 12 MP lens is really the same resolution as a 5 MP quality lens.<\/p>\n<p>The first thing to understand is that lenses are evaluated on their resolving power, which is a spatial resolution.\u00a0 For lens used in the industrial imaging marketplace, this is normally given in terms as &#8220;Line Pairs per mm&#8221; (LP\/mm).\u00a0 The reason it is expressed this way is because to resolve a pixel of &#8220;X&#8221; um, you need to use the formula, 1 \/ 2X where &#8220;X&#8221; is the pixel size and 2 is the Nyquist limit.\u00a0 So to resolve a pixel of 5um we need a resolution of 1\/ ( 5um*2)\u00a0 per line pair.\u00a0 In LP\/mm, this becomes 100 LP\/mm.<\/p>\n<p>A graph showing a lenses performance is shown in a\u00a0 plot below, plotting intensity vs. LP\/mm.\u00a0 This is called the Modulation Transfer Function (MTF). Note that as the LP\/mm increases and the lens can\u2019t resolve it as well, the intensity falls off.\u00a0 This measurement is variable to F stop and angle of light, so real MTF charts will indicated these parameters. <strong>This is the only real way to empirically evaluate how a lens will perform.<br \/>\n<a href=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Lens-MTF.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-799\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Lens-MTF.jpg\" alt=\"\" width=\"552\" height=\"872\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Lens-MTF.jpg 552w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Lens-MTF-190x300.jpg 190w\" sizes=\"auto, (max-width: 552px) 100vw, 552px\" \/><\/a><br \/>\n<\/strong><\/p>\n<p>You can visually compare lenses, but to truly compare Brand A vs. Brand B you would have to test them under identical situations.\u00a0 You can\u2019t compare Brand A\u2019s MTF vs. Brand B\u2019s if you don\u2019t know what the parameters used to test them are (need the same camera, with the same lighting, with the same focus, with the same f stop, the same gain, etc. etc.).\u00a0 Unfortunately its very hard to get that information from most lens manufacturers.<\/p>\n<p><strong>1, 3, 5, 9, 12 Megapixel lens?<\/strong><\/p>\n<figure id=\"attachment_802\" aria-describedby=\"caption-attachment-802\" style=\"width: 264px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.1stvision.com\/lens\/family\/Computar-MPY-1point1-inch-12MP-Series-Lenses\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-802\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Tamron-12MP-MPY-machine-vision-lenses.gif\" alt=\"Tamron 12MP MPY lenses\" width=\"264\" height=\"213\" \/><\/a><figcaption id=\"caption-attachment-802\" class=\"wp-caption-text\">Compliments of Computar<\/figcaption><\/figure>\n<p>What does this mean?\u00a0 As an example, Sony has recently introduced a new line of image sensors which\u00a0 have \u00a05MP, 9MP and 12MP sensors.\u00a0 Many clients have called and said,\u00a0 &#8220;I want to use the 12MP sensor, so please spec a lens that can do 12MP.\u201d\u00a0 Unfortunately, this isn\u2019t correct as each of these sensors uses a 3.45um pixel.\u00a0 <strong>They ALL need the same quality lens!\u00a0<\/strong> Why?\u00a0 Because it is the size of pixel, what you have to resolve, that dictates the quality of the lens!<\/p>\n<p>In the above situation, the 5MP sensor needs a 2\/3\u201d format lens, the 9MP needs a 1\u201d lens, and 12 MP needs a 1.1\u201d format lens.\u00a0 <em>(Multiply the size of the pixel by the number of H and V pixels to get the sensor format\u00a0 &#8211; more on format<span style=\"color: #003366;\"><strong> <a style=\"color: #003366;\" href=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2017\/08\/how-does-a-lens-optical-format-relate-to-machine-vision-cameras.html\" target=\"_blank\" rel=\"noopener\">HERE<\/a> <\/strong><\/span>).<\/em>\u00a0 However, this sensor needs about 144 LP\/mm of resolving power as its a 3.45um pixel size.\u00a0 As much as I detest the nomenclature of &#8220;5MP lens&#8221; etc., I do appreciate what<span style=\"color: #000080;\"><strong> <a style=\"color: #000080;\" href=\"https:\/\/www.1stvision.com\/lens\/families\/Fujinon-lenses\" target=\"_blank\" rel=\"noopener\">Fuji<\/a>\u00a0<\/strong><span style=\"color: #000000;\"> do<\/span><\/span>es; as they will state, &#8220;&#8230;. This\u00a0 series of high-resolution lenses deliver 3.45um pixel pitch (equivalent to 5MP) on a 2\/3&#8243; sensor&#8221;.\u00a0\u00a0 Now this make more sense!<\/p>\n<p>In turn, if you see a lens stated as a &#8220;Megapixel Machine vision&#8221; lens, question this!\u00a0 It really needs to be stated in terms of its capability to resolve the pixel size in LP\/mm!<\/p>\n<p><a href=\"https:\/\/www.1stvision.com\/contact\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-813 size-full\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Contact-to-speak-to-an-industry-expert-at-1stvision.png\" alt=\"Contact us\" width=\"459\" height=\"82\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Contact-to-speak-to-an-industry-expert-at-1stvision.png 459w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/Contact-to-speak-to-an-industry-expert-at-1stvision-300x54.png 300w\" sizes=\"auto, (max-width: 459px) 100vw, 459px\" \/><\/a><\/p>\n<p><span style=\"color: #003366;\"><strong><a style=\"color: #003366;\" href=\"http:\/\/www.1stvision.com\" target=\"_blank\" rel=\"noopener\">1stVision<\/a> <\/strong><\/span>has a staff of machine vision veterans who are happy to explain this in more detail and help you specify the best lens for your application!\u00a0\u00a0 <a href=\"https:\/\/www.1stvision.com\/contact\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #000080;\"><strong>Contact 1st Vision!<\/strong><\/span><\/a><\/p>\n<p><strong>Additional References:<\/strong><br \/>\nFor a comprehensive understanding on \u201cHow to Choose a Lens\u201d, download our whitepaper<span style=\"color: #000080;\"><strong> <a style=\"color: #000080;\" href=\"https:\/\/www.1stvision.com\/knowledgebase2\/55\/\">HERE. <\/a>\u00a0<\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\"><strong><a style=\"color: #000080;\" href=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2015\/06\/demystifying-lens-performance.html\" target=\"_blank\" rel=\"noopener\">Blog post:\u00a0 Demystifying Lens performance specifications<\/a><\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\"><strong><a style=\"color: #000080;\" href=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2017\/03\/fuji-hf-xa-5m-lens-series.html\" rel=\"bookmark\">Blog post:\u00a0 Learn about FUJI\u2019s HF-XA-5M (5 Megapixel) lens series which resolves 3.45um pixel pitch sensors! Perfect for cameras with Sony Pregius image sensors.<\/a><\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\"><strong><a style=\"color: #000080;\" href=\"https:\/\/www.1stvision.com\/lens\/machine-vision-lenses\" target=\"_blank\" rel=\"noopener\">Use the 1st Vision lens selector allowing you to filter by focal length, format and manufacturer to name a few<\/a><\/strong><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>There has been a lot written about the ratings of machine vision lenses.\u00a0 1stVision had created white papers that describe this in detail. However, the lens industry continues to use the marketing term, Megapixel Machine Vision Camera Lenses. Let\u2019s get this out of the way right now.\u00a0 There is NO such thing as a Megapixel &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2018\/02\/megapixel-machine-vision-lenses-2.html\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;There is NO such thing as a &#8220;Megapixel&#8221; machine vision camera lens!.. Say what??&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":826,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[51,61],"tags":[220,225,256,236,254,226,240,253,228],"class_list":["post-796","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lenses","category-tutorial","tag-1stvision_","tag-machinevision","tag-computer-vision","tag-fuji","tag-image-processing","tag-industrial-imaging","tag-machine-vision","tag-machine-vision-lenses","tag-schneider"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Misconceptions of Megapixel Machine Vision Camera Lenses<\/title>\n<meta name=\"description\" content=\"A big misconception has been spreading where machine vision lenses are being called megapixel camera lenses. Check out this white paper for more info.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2018\/02\/megapixel-machine-vision-lenses-2.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Misconceptions of Megapixel Machine Vision Camera Lenses\" \/>\n<meta property=\"og:description\" content=\"A big misconception has been spreading where machine vision lenses are being called megapixel camera lenses. Check out this white paper for more info.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2018\/02\/megapixel-machine-vision-lenses-2.html\" \/>\n<meta property=\"og:site_name\" content=\"1stVision Inc. - Machine Vision Articles\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/pages\/1st-Vision\/944658058935262?fref=ts\" \/>\n<meta property=\"article:published_time\" content=\"2018-02-22T22:28:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-14T15:35:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2018\/02\/machine-vision-lenses-e1519325169271.gif\" \/>\n\t<meta property=\"og:image:width\" content=\"300\" \/>\n\t<meta property=\"og:image:height\" content=\"299\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/gif\" \/>\n<meta name=\"author\" content=\"Jon Chouinard\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@1stvision_\" \/>\n<meta name=\"twitter:site\" content=\"@1stvision_\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jon Chouinard\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2018\/02\/megapixel-machine-vision-lenses-2.html#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.1stvision.com\/machine-vision-solutions\/2018\/02\/megapixel-machine-vision-lenses-2.html\"},\"author\":{\"name\":\"Jon Chouinard\",\"@id\":\"https:\/\/www.1stvision.com\/machine-vision-solutions\/#\/schema\/person\/00a12baae7298e2947857d28e5f8e5a4\"},\"headline\":\"There is NO such thing as a &#8220;Megapixel&#8221; machine vision camera lens!.. 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