A premium apochromatic long working distance objective delivering 20X magnification with 20mm of clearance — engineered for non-contact surface inspection, semiconductor analysis, and precision industrial metrology. The Mitutoyo M Plan Apo 20X (378-804-3) combines apochromatic optical correction with an extra-long 20mm working distance, making it ideal for applications where the objective must remain clear of the specimen, fixtures, or laser optics. 🔬 20X Plan Apochromat — flat-field, apochromatic correction for superior resolution and color fidelity 📏 20mm extra-long working distance — generous clearance for tall specimens, fixtures, and in-situ laser systems 🔵 NA 0.42 — high numerical aperture for an ELWD objective at this magnification 🔧 M26 thread mount — standard Mitutoyo mounting thread ♾️ Infinity-corrected — compatible with Mitutoyo infinity optical systems and tube lenses ⭐ New / open box condition — inspected by Spach Optics 🔧 Product Description The Mitutoyo M Plan Apo 20X (catalog 378-804-3) is part of Mitutoyo’s M Plan Apo series — infinity-corrected reflected light objectives designed for non-contact surface measurement, semiconductor inspection, and precision industrial imaging. The Plan Apochromat optical design delivers flat-field correction across the full field of view with apochromatic color correction, ensuring accurate, high-contrast imaging at 20X. The 20mm extra-long working distance is the defining characteristic of this objective, providing ample clearance for large or tall specimens, inspection fixtures, environmental enclosures, and in-situ laser systems such as YAG laser repair stations. At NA 0.42, it delivers high resolving power for an ELWD objective at this magnification — well above what is achievable with standard long working distance designs. The M26 thread mount is the standard Mitutoyo objective thread, compatible with Mitutoyo FS series inspection microscopes, VMU series, and other Mitutoyo infinity-corrected optical systems. Condition: new / open box, inspected by Spach Optics. Catalog number: 378-804-3. 🔎 Typical Applications Semiconductor wafer, die, and integrated circuit inspection In-situ YAG laser repair and defect evaluation of semiconductor devices Non-contact surface metrology and dimensional measurement Printed circuit board (PCB) and electronic component inspection Precision optics, coating, and surface finish inspection Materials science, failure analysis, and industrial quality control 📊 Key Specifications Specification Details Manufacturer Mitutoyo Catalog Number 378-804-3 Series M Plan Apo Magnification 20X Numerical Aperture (NA) 0.42 Working Distance 20mm (extra-long) Optical Correction Plan Apochromat (flat-field, apochromatic) Optical System Infinity-corrected Thread Mount M26 Illumination Reflected light Condition New / open box — inspected by Spach Optics Country of Origin Japan University and institutional customers: we accept purchase orders. Please contact us for net terms and procurement documentation.
