{"product_id":"mitutoyo-378-400-wli-plan-apo-2-5x-michelson-type","title":"Mitutoyo 378-400 WLI Plan Apo 2.5x Michelson Type","description":"\u003cp\u003eThe WLI Plan Apo 2.5X is a precision plan apochromat objective designed for white light interferometry (WLI) applications. Developed to integrate seamlessly with the WLI Unit, it enables accurate surface profiling and interferometric measurement across larger inspection areas.\u003c\/p\u003e\n\u003cp\u003eThe objective incorporates a beam splitter and reference mirror directly inside the lens body, allowing interferometric measurements without the need for additional external optical components. An integrated interference fringe adjustment mechanism is included as standard, enabling precise alignment and measurement optimisation.\u003c\/p\u003e\n\u003cp\u003eIts compact and lightweight design, combined with a 60 mm parfocal distance, allows efficient integration into interferometry systems while maintaining a generous 13 mm working distance. With a numerical aperture of 0.14, the objective is well suited for lower magnification interferometric inspection where larger fields of view are required.\u003c\/p\u003e\n\u003cp\u003eOptimised for the visible spectral range, the WLI Plan Apo 2.5X is ideal for surface metrology, topography analysis, and precision inspection applications.\u003c\/p\u003e\n\u003cp\u003eKey Features\u003c\/p\u003e\n\u003cp\u003eDesigned specifically for white light interferometry (WLI)\u003c\/p\u003e\n\u003cp\u003eBeam splitter and reference mirror integrated inside the objective\u003c\/p\u003e\n\u003cp\u003eInterference fringe adjustment mechanism included as standard\u003c\/p\u003e\n\u003cp\u003eCompact and lightweight design\u003c\/p\u003e\n\u003cp\u003eParfocal distance: 60 mm for compact system integration\u003c\/p\u003e\n\u003cp\u003eLong working distance design\u003c\/p\u003e\n\u003cp\u003eHigh-quality Plan Apochromat optical design\u003c\/p\u003e\n\u003cp\u003eInfinity corrected\u003c\/p\u003e\n\u003cp\u003eSpecifications\u003c\/p\u003e\n\u003cp\u003eModel: WLI Plan Apo 2.5X\u003c\/p\u003e\n\u003cp\u003eMagnification: 2.5x\u003c\/p\u003e\n\u003cp\u003eWorking distance: 13 mm\u003c\/p\u003e\n\u003cp\u003eNumerical Aperture (N.A.): 0.14\u003c\/p\u003e\n\u003cp\u003eResolving power: 2 µm\u003c\/p\u003e\n\u003cp\u003eFocal length (f): 40 mm\u003c\/p\u003e\n\u003cp\u003eParfocal distance (P.D.): 60 mm\u003c\/p\u003e\n\u003cp\u003eApplicable tube lens focal length: 100 mm\u003c\/p\u003e\n\u003cp\u003eField of view (2\/3\" camera): 2.64 × 3.52 mm\u003c\/p\u003e\n\u003cp\u003eField of view (WLI Unit): 2.94 × 2.25 mm\u003c\/p\u003e\n\u003cp\u003eObservation mode: Interferometer\u003c\/p\u003e\n\u003cp\u003eGlass compensation: No\u003c\/p\u003e\n\u003cp\u003eLaser applications: No\u003c\/p\u003e\n\u003cp\u003eSpectral range: Visible (VIS)\u003c\/p\u003e\n\u003cp\u003eMount: RMS (20.32 mm × 36 TP)\u003c\/p\u003e\n\u003cp\u003eOuter diameter: 36.4 mm (excluding interference unit), 58.5 mm (max)\u003c\/p\u003e\n\u003cp\u003eMirror tube length (excluding mounting screws): 47 mm\u003c\/p\u003e\n\u003cp\u003eMass: 320 g\u003c\/p\u003e","brand":"Mitutoyo","offers":[{"title":"Default Title","offer_id":56437813019004,"sku":"378-400","price":4824.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/9428\/5114\/files\/Mitutoyo378-400WLIPlanApo2.5xMichelsonType.jpg?v=1772650167","url":"https:\/\/www.hroberts-di.com\/products\/mitutoyo-378-400-wli-plan-apo-2-5x-michelson-type","provider":"H Roberts \u0026 Sons","version":"1.0","type":"link"}