{"product_id":"olympus-u-bi90ct-observation-tube","title":"Olympus U-BI90CT Observation Tube","description":"\u003cp style=\"font-family:'Segoe UI Emoji', sans-serif;\"\u003e🔬 \u003cstrong\u003eOlympus U-BI90CT binocular observation tube with centering telescope \/ Bertrand lens\u003c\/strong\u003e for IX series inverted microscopes\u003cbr\u003e⚡ \u003cstrong\u003eIntegrated centering telescope\u003c\/strong\u003e — enables phase ring centering, condenser alignment, and conoscopic observation directly through the observation head\u003cbr\u003e🎯 \u003cstrong\u003eBroad IX series compatibility\u003c\/strong\u003e — fits IX50, IX51, IX53, IX70, IX71, IX73, and IX81 inverted microscopes\u003cbr\u003e🏭 \u003cstrong\u003eMade in Japan\u003c\/strong\u003e by Olympus — guaranteed OEM fit and optical quality\u003cbr\u003e✅ \u003cstrong\u003eSKU U-BI90CT\u003c\/strong\u003e — excellent, as-new condition, significant savings vs. list price of $2,188\u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"font-family:'Segoe UI Emoji', sans-serif;\"\u003e\u003cstrong\u003e🔧 Product Description\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Olympus U-BI90CT is a binocular observation tube for Olympus IX series inverted microscopes, featuring an integrated centering telescope (Bertrand lens) for phase ring centering, condenser alignment, and conoscopic observation. In standard binocular heads, the operator must use a separate centering telescope or remove an eyepiece and insert a centering tool to view the objective back focal plane for phase ring alignment. The U-BI90CT eliminates this inconvenience by incorporating the centering telescope directly into the observation head — the Bertrand lens can be swung into the optical path to image the objective back focal plane for phase ring centering and condenser alignment, then swung out for normal observation, all without removing eyepieces or changing accessories. The centering telescope also enables conoscopic observation of birefringent specimens for polarized light interference figure analysis. Compatible with the full range of Olympus IX series inverted microscopes including the IX50, IX51, IX53, IX70, IX71, IX73, and IX81. This unit is in excellent, as-new condition at a significant discount from the list price.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"font-family:'Segoe UI Emoji', sans-serif;\"\u003e\u003cstrong\u003e🔎 Typical Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePhase contrast microscopy setup — centering telescope for rapid phase ring alignment without removing eyepieces or inserting separate centering tools\u003c\/li\u003e\n\u003cli\u003eCondenser alignment — Bertrand lens for back focal plane observation and Köhler illumination setup on IX series inverted microscopes\u003c\/li\u003e\n\u003cli\u003eConoscopic polarized light observation — interference figure analysis of birefringent specimens using the integrated Bertrand lens\u003c\/li\u003e\n\u003cli\u003eMulti-contrast IX series workflows — phase contrast, DIC, and polarized light on IX50, IX51, IX53, IX70, IX71, IX73, or IX81 platforms\u003c\/li\u003e\n\u003cli\u003eReplacement or upgrade observation head for IX series microscopes requiring integrated centering telescope capability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp style=\"font-family:'Segoe UI Emoji', sans-serif;\"\u003e\u003cstrong\u003e📊 Key Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOlympus Part Number\u003c\/td\u003e\n\u003ctd\u003eU-BI90CT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eBinocular Observation Tube with Centering Telescope \/ Bertrand Lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentering Telescope\u003c\/td\u003e\n\u003ctd\u003eIntegrated — swing-in\/swing-out Bertrand lens for back focal plane observation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Microscopes\u003c\/td\u003e\n\u003ctd\u003eOlympus IX50, IX51, IX53, IX70, IX71, IX73, IX81\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHS Code\u003c\/td\u003e\n\u003ctd\u003e901190\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eExcellent — As New\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003cp style=\"font-family:'Segoe UI Emoji', sans-serif;\"\u003e\u003cem\u003eUniversities and research institutions are welcome to purchase using an official purchase order. Please contact us to arrange PO-based ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Spach Optics, Inc.","offers":[{"title":"Default Title","offer_id":51695464120621,"sku":"U-BI90CT","price":995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/7965\/8029\/files\/OLYMPUS-U-BI90CT-2.jpg?v=1765525760","url":"https:\/\/www.spachoptics.com\/products\/olympus-u-bi90ct-observation-tube","provider":"Spach Optics, Inc.","version":"1.0","type":"link"}