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)
1. Monochromatic aberration
Chromatic aberration occurs due to the difference in refractive index depending on wavelength (color).
<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 (SH350PC-2R) with low price.
The picture below is taken with a super high magnification microscope （USH130CS-H1） using a high performance lens
|●Taking by the ultra-high magnification microscope （SH350OC-2R） with low price
|●Taking by a ultrahigh magnification microscope （USH130CS-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 （SH350PC-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.
<Actual footage of monochromatic aberration>
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 （SH350PC-2R）with low price
||Taking by a ultrahigh magnification microscope （USH130CS-H1） using a high performance lens
The picture on the left shows a blurred outline.
Curvature aberration does not induce blurring.
Symptoms include the curvature of straight lines around the screen periphery. Depending on the curvature symptoms, it can be categorized into pillow-shaped and barrel-shaped.
(For more information on curvature aberration, please refer to “What is Distortion?“)
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