Quantity calculated for the secondary as though it were a primary in a Schiefspiegler
Pertaining to third order astigmatism for the Strehl Intensity Ratio
Semi-axes of an ellipse
Aspheric plate profile constant (defining its spherical aberration)
Upper and lower points of a Schmidt plate
Stop positions in a Maksutov telescope
Normalized amplitude of the object, image function (OTF)
Eq. (3.485), Eq. (3.486)
Pertaining to the afocal form of a 2-mirror telescope
Pertaining to the aplanatic form of a 2-mirror telescope
Schwarzschild (conic) constant
Laux definition of conic parameter
Pertaining to Bouwers' achromatic meniscus
Pertaining to Bouwers-type meniscus
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