Since decentering coma is the principal curse, in practice, of the conventional Cassegrain telescope, the above formulae are extremely important. If the forms of bs2 corresponding to a classical telescope (Eq. (3.93)) or an aplanatic (RC) telescope (Eq. (3.109)) are inserted in (3.362), we recover the results of (3.358) and (3.356) respectively. In fact, Eq. (3.356) can be transformed at once into the form

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