Mitutoyo 378-807-3 M Plan Apo 7.5X Objective for bright-field observation in visible range

M Plan Apo 7.5X Objective Lens (Brightfield, Long Working Distance)

The M Plan Apo 7.5X is a precision 7.5x microscope objective designed for brightfield observation across the visible spectrum. With a long working distance of 35 mm, it provides excellent clearance for inspecting larger samples, uneven surfaces, or parts that require more space between the objective and the workpiece.

This objective features an infinity-corrected optical design and is corrected across 436–656 nm for consistent imaging performance and reliable colour reproduction. With a numerical aperture of 0.21, it delivers sharper detail than lower magnifications, offering a resolving power of 1.3 µm while still maintaining a practical depth of field of 6.2 µm.

Compatible with VMU / FS-70 / MF-U / Hyper MF-U microscope systems, the M Plan Apo 7.5X is a strong choice for brightfield inspection where a balance of field of view, working distance, and resolution is required.

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: 7.5x

Working Distance (in air): 35 mm

Numerical Aperture (N.A.): 0.21

Infinity corrected: Yes

Corrected wavelength range: 436–656 nm

Resolving power: 1.3 µm

Depth of field: 6.2 µm

Field of view (ø24 mm eyepiece): ø3.2 mm

Field of view (1/2” camera chip): 0.64 × 0.85 mm

Parfocal distance (P.D.): 95 mm

Spectral range: VIS

Observation mode: Brightfield

Glass compensation: No

Mass: 240 g