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Definition : the state of Abnormal optical condition,path ; It¡¯s related to lens polishing & assembly accuracy.
There are around 6 kinds of Aberration : (1) Spherical Ab.,(2) Coma, (3) Field Curvature, (4) Distortion, (5)Astigmatism, (6) Chromatic Ab.
This is not easy to improve after lens assembly finished : Because this comes from lens itself.
This is the reason why Lens evaluation specification is so important.
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