Aberration is the deviation from the ideal image formation in the optical system.
It is divided into two include: single chromatic aberration and monochromatic aberration.
You can further break down from here.
- Monochromatic aberration (axial chromatic aberration, magnification chromatic aberration)
- Single chromatic aberration (spherical aberration, coma aberration, astigmatism, field curvature, curvature aberration)
- Chromatic aberration occurs due to the difference in refractive index depending on wavelength (color).
Symptoms such as color drift and color blur occur on the screen.
- Single chromatic aberration (despite of curvature aberration) is due to the difference in the angle of incidence of light passing through the lens and the difference in passing position
Symptoms such as outline blur and bleeding occur on the screen.
* There is no blurring in curvature aberration. The line is curved at the periphery (edge) of the screen.
Depending on the symptoms of curvature, it is divided into a pincushion type and a barrel type.
(For curvature aberration, please refer to “What is distortion?”)
<About monochromatic aberration>
The focal point is connected at one point. However, the refractive index varies with the wavelength, the focal position will be shifted. This will occur as color drift and color blur on the screen.
It is a photograph of 10 yen coin at 1000 times.
The above picture was taken with the ultrahigh magnification microscope (SH140CCD) with low price.
The picture below is taken with a super high magnification microscope (USH 140 CCD – H1) using a high performance lens
|●Taking by the ultra-high magnification microscope (SH140CCD-2R) with low price|
|●Taking by a ultrahigh magnification microscope (USH 140 CCD – H1) using a high performance len|
You can see that color misalignment occurs when enlarging a part of the above picture (taken with the ultrahigh magnification microscope (SH140CCD – 2R)
<Single color aberration>
No matter where it passes through the lens, the focal position is on the same plane regardless of the angle of incidence at any angle. The focal position shifts due to the difference in refractive index.
This occurs as blurring or bleeding of the contour.
It is a photograph taken at 1000 times of a silicon wafer.
The photograph on the left was taken with the ultrahigh magnification microscope (SH140CCD – R) with low price
The picture on the right was taken with a super high magnification microscope (USH 140 CCD – H) using a high performance len.
|Taking by the ultra-high magnification microscope (SH140CCD-2R) with low price||Taking by a ultrahigh magnification microscope (USH 140 CCD – H1) using a high performance lens|
The picture on the left shows a blurred outline.
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