Abstract
The general method of differential correction of an optical system developed by the writer is adapted to the particular problem of the trigonometrical correction of a microcsope objective. Transfer coefficients are introduced which specify the rate of change of the spherical aberration, the zonal chromatic aberration, the departure from the sine condition, the numerical aperture, and the working distance with the constructional parameters of the system. A numerical example of the correction of a Lister type objective is given.
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