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...oil immersion objectives (McCrone and Delly 1972). In most cases, the Abbe lens system is not corrected for [[spherical%20aberration|spherical aberration]] ...Particle Atlas'', W. McCrone Associates, Chicago, IV, 1972 Comment: Three lens versions give numerical aperture of 1:40

...hose with high values. The human eye can resolve to about 100 micrometers. Compound microscopes can resolve down to 1 micrometer while electron microscopes can