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Rays in the pupil

Rays in the pupil

Fig. 3.18. Third order coma: the "coma patch"

2n'u' V ym whose centres are shifted from I by

n'u' \ym i.e. by the diameter of the circle concerned. The circles nest within two lines tangent to all circles which meet at I with an angle of 60°.

The total extent of the coma patch in the t-section is called the tangential coma and is given for y = ym by

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