noun
apochromat; apochromatic lens
Technical term in optics for a lens that brings three wavelengths into focus, reducing chromatic aberration. The gloss 'achromatic lens' is a broader term; an apochromat is a type of achromatic lens with higher correction.
from German Apochromat
この顕微鏡にはアポクロマートレンズが使われている。
This microscope uses an apochromatic lens.
アクロマート (achromat) corrects two wavelengths, while アポクロマート corrects three, offering superior color correction.
Borrowed from German 'Apochromat', a compound of 'apo-' (away from) and 'chromat' (color), referring to the lens's ability to reduce chromatic aberration.