The objective lens is roughly divided into several levels according to its performance. The first is achromatic objective lens. Microscopes that use this objective do not image all the way through, but only about 60 percent of the center of the field of view is clear, with some defects still present in the peripheral 40 percent.
Usually, we are used to placing the part being observed in the center of the field of view, so this does not affect the observation. If you want a 100% field of view with almost no defects, then you should choose a flat-field achromatic objective. It corrects for field curvature on top of achromatization, but is much more expensive and is generally fitted to medical and scientific microscopes. There is another class in between, the semi-flat-field achromatic objective, which allows that a 20% portion of the periphery of the field of view can have some defects.
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