State primary standard of units of optical power and modulation transfer function of spectacle optics and objectives GET 205-2025

The quality of the image formed by the optical system is determined by its modulation transfer function at various spatial frequencies. To ensure the uniformity of measurements of the modulation transfer function and create a reference base for the reproduction, storage and transmission of modulation transfer function, the State primary standard of optical power units for eyeglass optics GET 205-2013 was improved in terms of reproducing the modulation transfer function in the wavelength range 450–1550 nm. The composition, principle of operation and main metrological characteristics of the State primary standard of units of optical power and modulation transfer function of eyeglass optics and objectives GET 205-2025 are presented. The GET 205-2025 includes an installation for measuring the modulation transfer function of optical systems and a set of reference lenses. GET 205-2025 ensures the uniformity of measurements of the modulation transfer function of optical systems in the spectral range of discrete wavelength values 450–1550 nm and allows you to transfer the modulation transfer function by comparison using a comparator to working standards. From working standards by direct measurement, the modulation transfer function is transferred to modulation transfer function measuring instruments: modulation transfer function measuring devices, contrast transfer function measuring systems, optical benches, optical system quality control stations.

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