Mitutoyo 378-402 WLI Plan Apo 25x Mirau Type
SKU:Code: 378-402
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- brand Mitutoyo
- type Objective Lens for WLI
- mass 290g
- magnification 25x
- working distance 3.6mm
- numerical aperture 0.5
- working distance 3.6mm
- focal length 4mm
- resolving power (Microns) 0.55
- focal depth (Microns) 60
- view field 1 0.29x0.22mm Dia
- view field 2 0.26x0.35mm
The WLI Plan Apo 25X is a precision plan apochromat objective designed specifically for white light interferometry (WLI) applications. Developed to match the WLI Unit, this objective integrates key interferometric components directly within the lens body, enabling compact and highly stable measurement systems.
Its design incorporates an internal beam splitter and reference mirror, allowing accurate interferometric measurement without the need for external optical components. An integrated interference fringe adjustment mechanism is provided as standard, enabling precise alignment and optimisation during measurement.
With a high numerical aperture of 0.50, the WLI Plan Apo 25X delivers excellent resolution and measurement accuracy. The compact design, combined with a parfocal distance of 60 mm, ensures a lighter and more space-efficient setup while maintaining a 3.6 mm working distance.
Optimised for visible light interferometry, this objective is ideal for surface profiling, precision metrology, and high-resolution topography measurement.
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
High numerical aperture (0.50) for improved resolution
Compact and lightweight design
Parfocal distance: 60 mm for compact system integration
High-quality Plan Apochromat optical design
Infinity corrected
Specifications
Model: WLI Plan Apo 25X
Magnification: 25x
Working distance: 3.6 mm
Numerical Aperture (N.A.): 0.50
Resolving power: 0.55 µm
Focal length (f): 4 mm
Parfocal distance (P.D.): 60 mm
Applicable tube lens focal length: 100 mm
Field of view (2/3" camera): 0.26 × 0.35 mm
Field of view (WLI Unit): 0.29 × 0.22 mm
Observation mode: Interferometer
Glass compensation: No
Laser applications: No
Spectral range: Visible (VIS)
Mount: RMS (20.32 mm × 36 TP)
Outer diameter: 40 mm
Mirror tube length (excluding mounting screws): 57 mm
Mass: 290 g