Mitutoyo 378-803-3 M Plan Apo 10X Objective for bright-field observation in visible range

M Plan Apo 10X Objective Lens (Brightfield, Long Working Distance)

The M Plan Apo 10X is a precision 10x metallurgical microscope objective designed for brightfield observation across the visible spectrum. With a long 34 mm working distance, it provides excellent clearance for inspecting larger samples, uneven surfaces, or recessed features—making it ideal for industrial inspection and measurement work.

This objective features an infinity-corrected optical design and is corrected across 436–656 nm for consistent image quality and reliable colour performance. With a numerical aperture of 0.28, it delivers sharp detail with a resolving power of 1 µm, while maintaining a practical depth of field of 3.5 µm for stable focusing during routine observation.

Compatible with VMU / FS-70 / MF-U / Hyper MF-U microscope systems, the M Plan Apo 10X is a dependable choice for wide-area brightfield inspection with excellent optical clarity.

Note: To avoid optical flare when using coaxial illumination, 1x objectives should be used together with a polarisation unit and an attached 1/4 wavelength plate.

Key Specifications

Magnification: 10x

Working Distance (in air): 34 mm

Numerical Aperture (N.A.): 0.28

Infinity corrected: Yes

Corrected wavelength range: 436–656 nm

Resolving power: 1 µm

Depth of field: 3.5 µm

Field of view (ø24 mm eyepiece): ø2.4 mm

Field of view (1/2” camera chip): 0.48 × 0.64 mm

Parfocal distance (P.D.): 95 mm

Spectral range: VIS

Observation mode: Brightfield

Glass compensation: No

Mass: 240 g