Mitutoyo 378-867-5 M Plan Apo NIR B 20X Objective for bright-field observation in near-infrared range, WD: 25.5mm

The M Plan Apo NIR B 20X is a precision plan apochromat objective developed for bright field inspection and laser-based applications requiring extended clearance and stable multi-wavelength performance.

Optimised for wavelength correction from 420–1064 nm (Visible to Near-Infrared), this objective ensures consistent imaging quality across a broad spectral range, making it well suited for inspection and laser processing environments.

A defining feature of the NIR B series is its ultra-long 25.5 mm working distance, significantly improving operability while maintaining the numerical aperture performance of the standard NIR 20X/50X models. This additional clearance allows easier access to larger components, fixtures, and complex setups without compromising image quality.

With its infinity-corrected plan apochromat design, the M Plan Apo NIR B 20X delivers flat-field imaging, strong chromatic correction, and reliable focus stability across its specified wavelength range.

Key Features

Suitable for bright field inspection and laser-based applications

Wavelength correction from 420–1064 nm (Visible to Near-Infrared)

Ultra-long 25.5 mm working distance for improved operability

High-quality Plan Apochromat optical design

Infinity corrected

Maintains NA performance while extending working distance

Specifications

Model: M Plan Apo NIR B 20X

Magnification: 20x

Working distance (in air): 25.5 mm

Numerical Aperture (N.A.): 0.4

Corrected wavelength range: 420–1064 nm

Resolving power: 0.7 µm

Depth of field: 1.7 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.): 95 mm

Spectral range: NIR

Observation mode: Brightfield

Glass compensation: No

High Resolution: No

Mass: 350 g