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What are the common aberrations of auto focus industrial cameras

2021-09-15

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Aberration is an important factor that affects image quality, and the image quality of different machine vision lenses is also different. Even if the same type of industrial lens is used, the quality of the obtained image is due to the relationship between processing precision, lens structure and material. changes. Because of this, the price of industrial lenses also has a gap between 100 yuan and 10,000 yuan. When we choose an industrial lens, the first thing we need to think about is aberration, which is an important factor affecting the image quality. Common machine vision lens aberrations are as follows:

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1. Spherical difference

The monochromatic conical beam emitted from an object point on the main axis to the optical system, after being refracted by the optical series, if the rays of different aperture angles of the original beam cannot intersect at the same position on the main axis, so that the ideal image on the main axis is At the plane, a diffuse light spot (commonly known as the circle of ambiguity) is formed, and the imaging error of this optical system is called spherical aberration.

2. coma

The monochromatic conical beam emitted from an off-axis object point located outside the main axis to the optical system, after being refracted by the optical series, cannot form a clear point at the ideal image plane, but forms a trailing bright tail. , the imaging error of this optical system is called coma.

3. Astigmatism

The oblique monochromatic conical beam emitted to the optical system from an off-axis object point located outside the main axis cannot form a clear image point after being refracted by the optical series, but can only form a diffuse light spot, then this The imaging error of an optical system is called astigmatism.