Gf

where yi is the semi-aperture of the telescope and is equal to ym in Eq. (3.184). This is the lateral spherical aberration (image diameter) at the Gaussian focus. The disk of least confusion is therefore

4n'yi

The angular form is usually more convenient. For the Gaussian and best focus, the angular aberration (image diameter) is from (2.101) and (3.184):

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