Lateral Vs. Axial Chromatic Aberration

Difference Between Lateral and Chromatic aberration
There are two types of correction that can be applied to images to reduce or eliminate color fringing. Where and how this spread occurs, depends on the type of correction used.
Lateral chromatic aberration
Lateral chromatic aberration results primarily in the dispersion along the edge of the detail outer frame, and is caused by the lens that has a slightly different magnification for different colors. These differences in the magnification level results in a color glow along the edge of some details. It is important to note that the lateral chromatic aberration occurs only in the outer frame.
Cameras released after the D3 and D300 (except D60 and D3000) has a built-in function for automatic correction of lateral chromatic aberration. This is done automatically in the camera and cannot be adjusted by the user. They are used only along the edge of the image where it occurs. Capture NX2 is also a function for automatic correction of lateral chromatic aberration that can be turned on or off in menu Camera and Lens Correction (correction of camera and lens).
Axial chromatic aberration
Axial chromatic aberration gives blurry colors in front and behind the focus point because of differences in the focus point for different colors. This is especially visible in the outer edge of very bright areas in the image, but can occur in the whole picture, not just along the edge, as is the case of lateral chromatic aberration.
Correction of axial chromatic aberration is used in the View NX software from versions 1.3.0 and Capture NX 2 from version 2.2.0 and up. The correction is applied to all images and all types of files (NEF, JPEG, TIFF).
A slider for manual adjustment is also available. Value range for the slider for the correction of axial chromatic aberration is 0 to 100 The higher the value, the stronger the correction used. When the check box labeled Use of, the default value 50 This is the middle of the range, and allows users to increase or decrease the correction force is used.
In some rare cases, such as when shooting fireworks or night landscapes, the removal of dispersion with the correction of axial chromatic aberration and is perceived negatively, as the colors around the fireworks or the light in the image is reduced. In such cases, the slider is reduced below the standard value of 50 or switched off completely. These values are only indicators of the level of correction applied to the image, and has no connection with any specific measurable value. Since the correction factor varies from picture to picture, the results obtained with the same correction value wil be different from picture to picture.
The correction of lateral and axial aberration is independent of each other, and can be used on all image types (NEF, JPEG, TIFF) that are taken with older cameras. Note that it may be difficult to achieve the desired correction level with correction of axial chromatic aberration if there is a significant amount of aberration in the image, or if the subject is dark.

Category: VS  |  Tags: