Mitutoyo 378-824-16 M Plan Apo NIR 20X Objective for bright-field observation in near-infrared range

The M Plan Apo NIR 20X is a high-quality plan apochromat objective designed for bright field inspection and laser-based applications requiring performance across a wide spectral range. With wavelength correction from 480–1800 nm (Visible to Near-Infrared), this objective ensures stable imaging when switching between visible and NIR wavelengths.

Engineered with an infinity-corrected optical system, the M Plan Apo NIR 20X maintains image focus within the depth of field even when the illumination wavelength changes from visible light to near-infrared. This makes it particularly suitable for laser repair and inspection applications.

With a 20 mm working distance, the objective provides practical clearance while delivering reliable optical performance. A High-Resolving Power (HR) version is available within the M Plan Apo NIR range for applications requiring enhanced resolution.

Note: When operating above 1100 nm, the focusing position may deviate slightly from that in the visible range due to changes in glass dispersion and refractive index.

Key Features

Suitable for bright field inspection and laser-based applications

Wavelength correction from 480–1800 nm (Visible to Near-Infrared)

Designed to maintain focus when switching between visible and NIR wavelengths

High-quality Plan Apochromat optical design

Long working distance design

Infinity corrected

HR (High-Resolving Power) type available

Specifications

Model: M Plan Apo NIR 20X

Magnification: 20x

Working distance (in air): 20 mm

Numerical Aperture (N.A.): 0.40

Corrected wavelength range: 480–1800 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: Near-Infrared (NIR)

Observation mode: Brightfield

Glass compensation: No

High Resolution: No (HR version available)

Mass: 300 g