Chromatic Aberration

“Chromatic aberration” (also called “color fringing“) is caused by the lens not focusing different wavelengths of light onto the exact same focal plane (the focal length for different wave lengths is different), as can clearly be seen in the picture. Another way chromatic aberration can occur is when the lenses in the eyepiece magnify different wavelengths differently. These types of chromatic aberration are referred to as “Longitudinal Chromatic Aberration” and “Lateral Chromatic Aberration” respectively and can occur concurrently. The amount of chromatic aberration depends on the dispersion of the glass. Chromatic aberration should not occur with optical elements made from BaK-4 glass, since this glass is an extra low dispersion glass, which is not the case with BK-7 glass.

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