Chromatic Aberrations are color deviations of lens systems. The observer senses anything from a subtle halo of color at the edges of observed objects, to wild light shows which may interfere with resolution in the field of view.
These aberrations are usually the result of defective optics, poor coatings on lenses, or viewing targets through telescopes when the line of sight is not co-axial to the cylinder of the telescope. The best way to detect Chromatic Aberrations in magnification systems is to look through the lens(es) at a black and white image, preferably one with sharp lines of demarcation. An Amsler Grid (white lines on a black background) is an ideal target for detecting Chromatic Aberrations.
Levels of Chromatic Aberration:
3 = Ideal. No colour visible on Black and White (here shown as a view through telescopes of an Amsler grid)
2 = Color Visible (here evidenced primarily in the violet end of the color spectrum)
1 = Colour visible and degrades image, but not interfering with resolution
0 = Colour visible and degrades image, plus interferes with resolution
Chromatic Aberrations
--- may be mistaken for poor resolution of the lens system
---may be contributory to poor resolution of the lens system
--- may be mistaken for poor Clarity of Image
---may be contributory to poor Clarity of Image
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