Mitutoyo M Plan Apo 50x Objective (NA 0.55, WD 13mm, Infinity, M26)

The Mitutoyo M Plan Apo 50× (378-805-3) is a long working distance plan apochromat objective combining 50× magnification with a 13mm working distance — providing the practical balance between magnification and working clearance that makes it one of the most versatile objectives in the M Plan Apo series for industrial and semiconductor inspection. The 13mm working distance provides clearance for the full range of semiconductor inspection fixtures, environmental chambers, cryostats, vacuum systems, and laser processing setups, as well as ample room for beam delivery optics and collection systems that must coexist with the imaging objective. At 50× with a 0.48mm field of view (with Ø24 eyepiece), this objective provides a practical balance between field of view and resolution for detailed surface inspection, defect analysis, and feature measurement. The plan apochromat correction ensures flat-field imaging with accurate chromatic registration across the full visible spectrum, essential for accurate color-based defect analysis and documentation. At NA 0.55 with 0.7µm resolving power, this objective delivers sub-micron resolution for detailed inspection. For NIR or SWIR applications, see the M Plan Apo NIR 50× variants (378-825-17 for maximum WD, 378-863-5 for maximum NA). Compatible with Mitutoyo FS series microscopes and other infinity-corrected systems with M26 thread nosepieces. Catalog number 378-805-3.