DIN ISO 14490-7:2017-09

This document specifies the test methods for the determination of the limit of resolution of telescopic systems and observational telescopic instruments. There are various characteristics which are relevant for overall image quality of telescopic systems and observational telescopic instruments. Two important characteristics are the limit of resolution and the optical transfer function. This document specifies the test method for the determination of the limit of resolution of telescopic systems and observational telescopic instruments. Besides the limit of resolution and the optical transfer function, further characteristics are relevant for an assessment of the image quality; the most important of them are the secondary spectrum (dispersive aberrations), the distortion of the Image, the vignetting and the colour matching.