Chromatic Aberration
Chromatic aberration appears as color fringes around objects in images. It happens because different colors of light refract at slightly different angles. Blue and red light often focus at different distances when passing through a lens. This type of aberration reduces image sharpness and color accuracy.
Correcting chromatic aberration can involve using special lens coatings or additional lens elements that compensate for color dispersion.
There are two types of chromatic aberrations. They are:
- Lateral Chromatic Aberration
- Longitudinal Chromatic Aberration
Lateral Chromatic Aberration
Lateral chromatic aberration occurs when different wavelengths of light are focused at different positions on the same focal plane. It is also known as transverse chromatic aberration. This type of aberration results in color fringes appearing around the edges of objects in the image.
It is more noticeable towards the edges of the optical field and varies with the aperture size. Lateral chromatic aberration is often seen as color outlines that can degrade image quality in high-contrast scenes.
Longitudinal Chromatic Aberration
Longitudinal chromatic aberration happens when different wavelengths of light are focused at different distances along the optical axis. This causes a shift in focus between colors, with some colors focusing slightly in front of or behind the sensor or film plane.
It is also called axial chromatic aberration. This effect is most apparent in images with shallow depth of field, where it shows as halos of color around out-of-focus areas. It is noticeable in the background blur of images.
Aberration of Lens
Aberration of the lens refers to the failure of a lens to produce a perfect image. It occurs due to the lens’s geometry and light’s physical properties. There are several lens aberrations, each affecting the image in different ways.
In this article, we will discuss lens aberration, its types, corrections methods, and many more in detail.
Table of Content
- Lens Aberration
- Types of Lens Aberrations
- Curvature of Field and Distortion
- Combination of 2 Lenses to Reduce Chromatic Aberration
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