Ritchey-Chretien form of a 2-mirror Cassegrain telescope
Optimum radius of curvature of the field
Root-mean-square wavefront aberration
Pertaining to angular decenter of the secondary in a 2-mirror telescope
Seidel surface contribution to Seidel aberration q
Seidel term including stop shift
Basic (power) part of a Seidel term
Aspheric part of a Seidel term
Contribution of an aspheric plate to the third order spherical aberration
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