Mitutoyo 378-810-3 M Plan Apo SL20X Objective for bright-field observation in visible range, SL Super Long working distance
SKU:Code: 378-810-3
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- brand Mitutoyo
- mass 240g
- magnification 20x
- working distance 30.5mm
- numerical aperture 0.28
- working distance 30.5mm
- focal length 10mm
- resolving power (Microns) 1
- focal depth (Microns) 3.5
- view field 1 mm Dia
- view field 2 0.24x0.32mm
M Plan Apo SL 20X Objective Lens (Brightfield, Extra-Long Working Distance)
The M Plan Apo SL 20X is a high-quality 20x metallurgical microscope objective designed for brightfield observation in the visible spectrum. With an exceptionally long 30.5 mm working distance, it provides excellent clearance for inspecting uneven, delicate, or recessed samples—making it ideal for industrial inspection and measurement work.
This objective is infinity corrected and optically optimised across a wide wavelength range (436–656 nm) for consistent performance. With a numerical aperture of 0.28, it offers a strong balance between resolution and depth of field, delivering a resolving power of 1 µm and a depth of field of 3.5 µm for practical, stable focusing during routine observation.
Compatible with VMU / FS-70 / MF-U / Hyper MF-U microscope systems, the M Plan Apo SL 20X is a reliable choice for precision brightfield microscopy where working distance is a priority.
Key Specifications
Magnification: 20x
Working Distance (in air): 30.5 mm (extra-long)
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): ø1.2 mm
Field of view (1/2” camera chip): 0.24 × 0.32 mm
Parfocal distance (P.D.): 95 mm
Spectral range: VIS
Observation mode: Brightfield
Glass compensation: No
Mass: 240 g