Basic Types of Microscope Objectives
(1) According to the length of the microscope lens tube (in mm): 160 lens tube for transmitted light, with a 0.17mm thick or thicker cover glass; 190 lens tube for reflected light, without a cover glass; transmitted light and reflection The lens barrel is used for light, and the length of the barrel is infinite.
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(2) Characteristics of dipping method: non-immersing (dry type), immersion (oil immersion, water immersion, glycerin immersion and other immersion methods).
(3) According to the optical device: transmissive, reflective and catadioptric.
(4) According to numerical aperture and magnification: low magnification (NA≤0.2 and β≤10X), medium magnification (NA≤0.65 and β≤40X), high magnification (NA＞0.65 and β＞40X).
(5) According to the situation of correcting aberration, it is usually divided into achromatic objective lens, semi-apochromatic objective lens, apochromatic objective lens, flat-field achromatic objective lens, flat-field apochromatic objective lens and monochromatic objective lens.
