Rc

Ritchey-Chretien form of a 2-mirror Cassegrain telescope

§ 3.2.6.3(b)

Tc

Optimum radius of curvature of the field

Fig. 3.4

rms

Root-mean-square wavefront aberration

Table 3.27

Tot (suffix)

Pertaining to angular decenter of the secondary in a 2-mirror telescope

Eq. (3.374)

Sq

Seidel surface contribution to Seidel aberration q

Eq. (3.18)

S+

Seidel term including stop shift

Eq. (3.22)

s0

Basic (power) part of a Seidel term

Eq. (3.24)

s;

Aspheric part of a Seidel term

Eq. (3.24)

ÔSÎ

Contribution of an aspheric plate to the third order spherical aberration

Eq. (3.219)

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