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Optical transfer functions (OTF) of two types of spectrometer – Eagle mounting and Seya-Namioka mounting – are calculated by the wave-optical method which defines the OTF as the autocorrelation function of the pupil. Results obtained are compared with previous results of the present authors and interpreted as effects of diffraction and aberration on the broadening of point image. The OTFs are calculated also by Fourier transformation of the intensity distribution of point image and compared with those obtained by the first method.
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Katayama et al. (1970) studied this question.
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