Dependence of Strehl ratio on f-number of optical system.
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.
Czech Technical University in Prague, Faculty of Civil Engineering, Department of Physics, Prague, Czech Republic. miks@fsv.cvut.cz
Antonin
A
Miks
Jiri
J
Novak
Pavel
P
Novak