{"product_id":"j-btlm-2-3-bi-telecentric-lens","title":"BTLM 2\/3\" Bi-Telecentric Lens Series | High Precision Machine Vision Measurement Lens","description":"\u003cdiv\u003e\n\u003ch2\u003eProduct Description\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Precision 2\/3\" Bi-Telecentric Lenses for Industrial Measurement and Machine Vision\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe BTLM 2\/3\" Series bi-telecentric lenses are engineered for high-accuracy machine vision and metrology applications, offering ultra-stable imaging performance with zero perspective error across the entire field of view.\u003c\/p\u003e\n\u003cp\u003eDesigned specifically for 2\/3\" industrial area scan cameras (Φ11mm sensor support), this series provides multiple magnification options from 0.166X to 0.5X, making it ideal for both wide-field inspection and precision measurement tasks.\u003c\/p\u003e\n\u003cp\u003eWith ultra-low distortion (\u0026lt;0.1% \/ \u0026lt;0.03% depending on model), high telecentricity (\u0026lt;0.1°), and MTF performance exceeding 160–260 lp\/mm, the BTLM series ensures extremely sharp and repeatable imaging results in demanding industrial environments.\u003c\/p\u003e\n\u003cp\u003eOptional coaxial illumination versions (D models) are available for reflective surfaces, while manual iris options enable flexible depth-of-field control in complex inspection conditions.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cp\u003e✔ Optimized for 2\/3\" Sensors (Φ11mm Image Circle)\u003cbr\u003ePerfect match for high-resolution industrial area scan cameras.\u003c\/p\u003e\n\u003cp\u003e✔ Wide Magnification Range (0.166X–0.5X)\u003cbr\u003eFlexible configuration for different inspection fields of view.\u003c\/p\u003e\n\u003cp\u003e✔ Ultra-High Optical Resolution (MTF \u0026gt;160–260 lp\/mm)\u003cbr\u003eEnsures sharp detail capture for precision metrology.\u003c\/p\u003e\n\u003cp\u003e✔ Ultra-Low Distortion (\u0026lt;0.03%–\u0026lt;0.1%)\u003cbr\u003eProvides highly accurate geometric measurement.\u003c\/p\u003e\n\u003cp\u003e✔ Zero Perspective Error Design\u003cbr\u003eEnsures stable and repeatable measurement accuracy.\u003c\/p\u003e\n\u003cp\u003e✔ Optional Coaxial Illumination Versions (D Models)\u003cbr\u003eIdeal for reflective or low-contrast surfaces.\u003c\/p\u003e\n\u003cp\u003e✔ Long Working Distance Design (65–173mm)\u003cbr\u003eFlexible integration into industrial inspection systems.\u003c\/p\u003e\n\u003cp\u003e✔ Optional Manual Iris (Selected Models)\u003cbr\u003eAllows depth of field optimization and image tuning.\u003c\/p\u003e\n\u003ch2\u003eIdeal Applications\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePrecision Metrology\u003c\/li\u003e\n\u003cli\u003eSemiconductor Inspection\u003c\/li\u003e\n\u003cli\u003eElectronics Manufacturing\u003c\/li\u003e\n\u003cli\u003ePCB Inspection\u003c\/li\u003e\n\u003cli\u003eAutomated Optical Inspection (AOI)\u003c\/li\u003e\n\u003cli\u003eDimensional Measurement Systems\u003c\/li\u003e\n\u003cli\u003eIndustrial Quality Control\u003c\/li\u003e\n\u003cli\u003eHigh-Accuracy Machine Vision Systems\u003c\/li\u003e\n\u003cli\u003eReflective Surface Inspection (Coaxial Models)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e2\/3\" C-Mount Telecentric Lens\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable style=\"width: 99.964%; height: 137.2px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003cth style=\"text-align: center; width: 29.7785%; height: 39.2px;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"text-align: center; width: 13.9814%; height: 39.2px;\"\u003eVariable Iris\u003c\/th\u003e\n\u003cth style=\"text-align: center; width: 9.80511%; height: 39.2px;\"\u003eCoaxial\u003c\/th\u003e\n\u003cth style=\"text-align: center; width: 10.1571%; height: 39.2px;\"\u003eMag\u003c\/th\u003e\n\u003cth style=\"text-align: center; width: 10.7242%; height: 39.2px;\"\u003eWD (mm)\u003c\/th\u003e\n\u003cth style=\"text-align: center; width: 8.3525%; height: 39.2px;\"\u003eF\/#\u003c\/th\u003e\n\u003cth style=\"text-align: center; width: 16.1603%; height: 39.2px;\"\u003eMTF30 (lp\/mm)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"text-align: center; width: 29.7785%; height: 19.6px;\"\u003eBTLM-0.5X-65-23\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 13.9814%; height: 19.6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 9.80511%; height: 19.6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.1571%; height: 19.6px;\"\u003e0.5X\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.7242%; height: 19.6px;\"\u003e65±1\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 8.3525%; height: 19.6px;\"\u003e5.0\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 16.1603%; height: 19.6px;\"\u003e\u0026gt;160\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"text-align: center; width: 29.7785%; height: 19.6px;\"\u003eBTLM-0.5X-65D-23\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 13.9814%; height: 19.6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 9.80511%; height: 19.6px;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.1571%; height: 19.6px;\"\u003e0.5X\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.7242%; height: 19.6px;\"\u003e65±1\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 8.3525%; height: 19.6px;\"\u003e5.0\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 16.1603%; height: 19.6px;\"\u003e\u0026gt;160\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"text-align: center; width: 29.7785%; height: 19.6px;\"\u003eBTLM-0.4X-85-23\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 13.9814%; height: 19.6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 9.80511%; height: 19.6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.1571%; height: 19.6px;\"\u003e0.4X\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.7242%; height: 19.6px;\"\u003e85±2\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 8.3525%; height: 19.6px;\"\u003e4.5\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 16.1603%; height: 19.6px;\"\u003e\u0026gt;205\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"text-align: center; width: 29.7785%; height: 19.6px;\"\u003eBTLM-0.4X-85D-23\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 13.9814%; height: 19.6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 9.80511%; height: 19.6px;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.1571%; height: 19.6px;\"\u003e0.4X\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.7242%; height: 19.6px;\"\u003e85±2\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 8.3525%; height: 19.6px;\"\u003e4.5\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 16.1603%; height: 19.6px;\"\u003e\u0026gt;205\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"text-align: center; width: 29.7785%; height: 19.6px;\"\u003eBTLM-0.166X-173-23 (IA)\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 13.9814%; height: 19.6px;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 9.80511%; height: 19.6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.1571%; height: 19.6px;\"\u003e0.166X\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 10.7242%; height: 19.6px;\"\u003e173±3\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 8.3525%; height: 19.6px;\"\u003e3.3\u003c\/td\u003e\n\u003ctd style=\"text-align: center; width: 16.1603%; height: 19.6px;\"\u003e\u0026gt;260\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e\n    .size-chart {\n        width: 100%;\n        border-collapse: collapse;\n        margin-bottom: 20px;\n    }\n    .size-chart th, .size-chart td {\n        border: 1px solid #ddd;\n        padding: 10px;\n        text-align: center;\n    }\n    .size-chart th {\n        background-color: #f4f4f4;\n        font-weight: bold;\n    }\n    .size-chart tr:nth-child(even) {\n        background-color: #f9f9f9;\n    }\n\u003c\/style\u003e\n\u003cstyle\u003e\n    .size-chart {\n        width: 100%;\n        border-collapse: collapse;\n        margin-bottom: 20px;\n    }\n    .size-chart th, .size-chart td {\n        border: 1px solid #ddd;\n        padding: 10px;\n        text-align: center;\n    }\n    .size-chart th {\n        background-color: #f4f4f4;\n        font-weight: bold;\n    }\n    .size-chart tr:nth-child(even) {\n        background-color: #f9f9f9;\n    }\n\u003c\/style\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eWarm tips：The above DOF is just theoretical value at the ideal aperture (eg. ±763@F11). Actual DOF or the DOF what you need, please check with our sales engineer before order cfm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/t6R_Dji_xLc?si=45SnZch8Xt9ReYtA\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eTelecentric Lenses Download\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 20px; text-align: left;\"\u003e\u003ca href=\"https:\/\/www.contrastech.com\/upfile\/onlinedoc\/online_doc_download_directory_EN\/Telecentric_Lenses_CT_EN_RLS.pdf\" class=\"download-btn\" style=\"flex: 1 1 calc(50% - 20px); max-width: 400px;\" target=\"_blank\"\u003e\n\u003cdiv class=\"download-item\" style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0655\/5490\/7394\/files\/01_d45190e9-6b75-48da-b72f-496d29caec61_430x.png\" alt=\"Datasheet Download\" style=\"width: 250px; height: 79px;\"\u003e\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/div\u003e\n\u003cstyle\u003e\n  .download-btn {\n    text-decoration: none;\n    transition: transform 0.3s ease;\n    display: flex;\n    align-items: center;\n    justify-content: center;\n  }\n  .download-btn:hover {\n    transform: scale(1.05);\n  }\n  .download-item {\n    width: 100%;\n    padding: 15px;\n    border: 1px solid #ddd;\n    border-radius: 5px;\n    background-color: #f9f9f9;\n    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);\n    transition: box-shadow 0.3s ease;\n    text-align: center;\n  }\n  .download-item:hover {\n    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);\n  }\n  .download-item img {\n    display: block;\n    margin: 0 auto 10px;\n  }\n\u003c\/style\u003e","brand":"Contrastech","offers":[{"title":"WD:65mm Mag.0.5x","offer_id":47479459414262,"sku":"BTLM-0.5X-65-23","price":725.0,"currency_code":"USD","in_stock":true},{"title":"WD:65mm Mag.0.5x Coaxial","offer_id":47479714578678,"sku":"BTLM-0.5X-65D-23","price":780.0,"currency_code":"USD","in_stock":true},{"title":"WD:85mm Mag.0.4x","offer_id":47479714611446,"sku":"BTLM-0.4X-85-23","price":660.0,"currency_code":"USD","in_stock":true},{"title":"WD:85mm Mag.0.4x Coaxial","offer_id":47479714644214,"sku":"BTLM-0.4X-85D-23","price":715.0,"currency_code":"USD","in_stock":true},{"title":"WD:173mm Mag.0.166x Variable Iris","offer_id":47479714742518,"sku":"BTLM-0.166X-173-23(IA)","price":825.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1779\/7622\/files\/btlm-2-3-bi-telecentric-lens-series.jpg?v=1782195027","url":"https:\/\/shop.contrastech.com\/it\/products\/j-btlm-2-3-bi-telecentric-lens","provider":"Contrastech","version":"1.0","type":"link"}