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OComa due to misalignment of optical elements
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Coma is a well known aberration. It is usually known as an off-axis aberration (see figure at lower right),
whose magnitude increases with field angle. However, coma can also arise due to the misalignment of the optical elements, as the first two figures show. In that case, one gets constant coma over the field, with all the comatic images pointing in the same direction. |
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