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Dependence of Strehl ratio on f-number of optical system
Antonin Miks1, Jiri Novak, Pavel Novak
1Czech Technical University in Prague, Faculty of Civil Engineering, Department of Physics, Prague, Czech Republic. miks@fsv.cvut.cz
Abstract:
Formulas for a minimum of wave aberration variance and a maximum of the Strehl ratio in the optimal image point are derived using the third- and fifth-order aberration theory. Moreover, relations for the calculation of the optimal value of f-number of the optical system were derived, which enabled us to theoretically analyze real optical systems and their image quality. The optimal f-number corresponds to such a value of f-number when the image quality of a real optical system is comparable to an aberration-free optical system. This value may also serve as an auxiliary criterion of the image quality of the optical system, for example, in photography.
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