Mitutoyo 378-400 WLI Plan Apo 2.5x Michelson Type
SKU:Code: 378-400
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- brand Mitutoyo
- type Objective Lens for WLI
- mass 320g
- magnification 2.5x
- working distance 13mm
- numerical aperture 0.14
- working distance 13mm
- focal length 40mm
- resolving power (Microns) 2
- focal depth (Microns) 60
- view field 1 2.94x2.25mm Dia
- view field 2 2.64x3.52mm
The 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.
The 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.
Its 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.
Optimised for the visible spectral range, the WLI Plan Apo 2.5X is ideal for surface metrology, topography analysis, and precision inspection applications.
Key Features
Designed specifically for white light interferometry (WLI)
Beam splitter and reference mirror integrated inside the objective
Interference fringe adjustment mechanism included as standard
Compact and lightweight design
Parfocal distance: 60 mm for compact system integration
Long working distance design
High-quality Plan Apochromat optical design
Infinity corrected
Specifications
Model: WLI Plan Apo 2.5X
Magnification: 2.5x
Working distance: 13 mm
Numerical Aperture (N.A.): 0.14
Resolving power: 2 µm
Focal length (f): 40 mm
Parfocal distance (P.D.): 60 mm
Applicable tube lens focal length: 100 mm
Field of view (2/3" camera): 2.64 × 3.52 mm
Field of view (WLI Unit): 2.94 × 2.25 mm
Observation mode: Interferometer
Glass compensation: No
Laser applications: No
Spectral range: Visible (VIS)
Mount: RMS (20.32 mm × 36 TP)
Outer diameter: 36.4 mm (excluding interference unit), 58.5 mm (max)
Mirror tube length (excluding mounting screws): 47 mm
Mass: 320 g