The dimensions are length throughout, since the coefficients each represent a linear wavefront shift in the z-axis direction or along the principal ray. The various powers of (yi/f ) are the same as the aperture factors in Eq. (3.21). Similarly, the various powers of upr1 correspond in angular measure to the image height factors in (3.21).
Another important property is that the terms in spr1 and spr1 in the equations for (S//)1 and (Sjjj)1 are simply the "stop-shift terms" containing corresponding powers of 3E in Eq. (3.22), since the "stop shift" from the primary is expressed simply by — spr1/y1 from (3.25).
In § 3.2.6, we shall discuss the consequences of Eqs. (3.26) for the design of 1-mirror telescopes.
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