Mitutoyo 378-847 G Plan Apo 20X (t3.5) Objective for bright-field observation in visible range with cover glass compensation
SKU:Code: 378-847
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- brand Mitutoyo
- type Objective Lens
- mass 270g
- magnification 20x
- working distance 29.42mm
- numerical aperture 0.28
- working distance 29.42mm
- focal length 10mm
- resolving power (Microns) 1
- focal depth (Microns) 3.5
- view field 1 1.2mm Dia
- view field 2 0.24x0.32mm
The G Plan Apo 20X is a precision plan apochromat objective specifically engineered for bright field inspection through 3.5 mm thick cover glass. Designed for applications where observation must be carried out through protective or structural glass, it ensures accurate, high-contrast imaging without optical distortion.
Featuring an infinity-corrected optical system and high-quality plan apochromat design, the G Plan Apo 20X delivers flat-field performance and excellent chromatic correction across the visible wavelength range (436–656 nm).
With an extended working distance of 30.6 mm through 3.5 mm glass, this objective provides exceptional clearance while maintaining strong optical performance. Dedicated glass thickness correction ensures optimal image quality when observing through thick substrates.
Compatible with VMU / FS-70 / MF-U / Hyper MF-U microscope systems, the G Plan Apo series is ideal for industrial inspection environments where reliable observation through thick glass is required.
Customisation Available: Mitutoyo can provide custom cover glass correction to suit specific applications. Thickness, material, and refractive index can be specified within standard limits.
Key Features
Designed for observation through 3.5 mm thick cover glass
High-quality Plan Apochromat optical design
Infinity corrected
Dedicated glass thickness compensation
Optimised for visible wavelength range (436–656 nm)
Custom cover glass correction available on request
Specifications
Model: G Plan Apo 20X
Magnification: 20x
Glass thickness correction: t3.5 mm
Working distance (through glass): 30.6 mm
Working distance (in air): 29.42 mm
Numerical Aperture (N.A.): 0.28
Corrected wavelength range: 436–656 nm
Resolving power: 1 µm
Depth of field: 3.5 µm
Field of view (ø24 mm eyepiece): ø1.2 mm
Field of view (1/2” camera chip): 0.24 × 0.32 mm
Parfocal distance (P.D.): 96.19 mm
Spectral range: VIS
Observation mode: Brightfield
Glass compensation: Yes
Laser applications: No
Mass: 270 g