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The aberration related to a wide beam of light is spherical aberration, coma aberration, and positional chromatic aberration; The aberrations related to the field of view are astigmatism, field curvature, distortion, and magnification aberration.

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The objective lens is the most important optical component of a microscope, which uses light to create the first image of the object being tested. Therefore, it directly affects and affects the quality of the image and various optical technical parameters, and is the primary standard for measuring the quality of a microscope.

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The structure of the objective lens is complex and precise, usually composed of a combination of lenses, with each lens spaced at a certain distance to reduce the difference. Each group of lenses is made by bonding one or several lenses with different materials and parameters. There are many specific requirements for the objective lens, such as axial alignment and alignment. The modern microscope objective has reached a high level of perfection, with its numerical aperture approaching its limit, and the difference between the resolution at the center of the field of view and the theoretical value is negligible. However, the possibility of further increasing the field of view of the microscope objective and improving the imaging quality of the field edge still exists, and this research work is still ongoing to this day.

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Microscopic objective and eyepiece differ in their involvement in imaging. Objective is the most complex and important part of a microscope, operating in a wide beam of light (with a large aperture), but these beams have a smaller inclination angle to the optical axis (with a smaller field of view); The eyepiece works in a narrow beam of light, but its inclination angle is large (with a large field of view). When calculating the objective and eyepiece, there is a significant difference in eliminating aberration.

Aligning focus is not only used in microscopy, but also when observing images clearly with a certain magnification objective, and when switching to another magnification objective, the imaging should be basically clear, and the center deviation of the image should also be within a certain range, that is, the degree of axis alignment. The quality of confocal performance and the degree of alignment are important indicators of microscope quality, which are related to the quality of the objective lens itself and the accuracy of the objective lens converter.

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Microscopic objective is an aberration cancelling system. This means that for a pair of conjugate points on the axis, when the aberration is eliminated and the sine condition is achieved, each objective only has two such aberration cancellations. Therefore, any change in the calculated position of the object and image results in an increase in aberration. On the rotator installed at the lower end of the lens barrel, there are generally 3-4 objective lenses, among which the shortest one engraved with the "10 ×" symbol is a low magnification lens, the longer one engraved with the "40 ×" symbol is a high magnification lens, and the longest one engraved with the "100 ×" symbol is an oil lens. In addition, a circle of different colors is often added to the high magnification lens and the oil lens to show the difference.

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