AO American Optical 10x Plan Apo Microscope Objective Lens 1321 Infinity USA

  
For discerning collectors and optical enthusiasts of classic American scientific instrumentation, this is a premium example of an American Optical (AO) 10x Plan Apochromatic infinity-corrected objective lens (Catalog #1321). Produced during the peak era of AO's high-performance laboratory manufacturing in the United States, Plan Apo lenses represent the absolute highest tier of optical correction available. Apochromatic correction ensures that three primary wavelengths of light (red, green, and blue) are brought to the same focus point, virtually eliminating chromatic aberration, while the "Plan" designation provides edge-to-edge flat-field correction-crucial for high-end photomicrography and precise specimen analysis. Featuring a generous 0.30 Numerical Aperture, this infinity-corrected piece delivers outstanding light-gathering capacity and exceptional resolution. This specimen is complete with its characteristic double-green identification bands and original factory storage capsule, making it a highly desirable upgrade or replacement piece for a vintage AO professional setup.