Achromatic Objective

A type of microscope objective that has a flat field in approximately 65% of the center of the image, compared to the 80% of a Semi-Plan objective and the 95% of a Plan objective. They correct for chromatic aberration in the red and blue wavelengths and spherical aberration in the green wavelength.

See also Wide-Field Eyepiece , Plan Objective , Semi-Plan Objective

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