It can be used for various applications such as Ronchi Ruling use, evaluation of limit resolution of imaging optical system, evaluation of distortion, confirmation of diffraction phenomena.

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Since Ronchi Ruling is a product manufactured for the purpose mainly used for the aforementioned subjective evaluation use, the frequency accuracy of the pattern is somewhat rough as a pattern used for calibration, and for that purpose we do not recommend it in general.

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Sep 3, 2021 — Meanwhile, lenses with short focal lengths have a larger depth of field, which enables them to get a wider range of elements in focus.

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Ronchi Ruling is a pattern that arranges parallel lines regularly. The line width forming the parallel line is equal to the width of the space. "Unit / mm" is used to express the spatial frequency per 1 mm, and 600 lines / mm are displayed on the right edge of the board. The unit of book / mm shows quantity of sets per mm, with one set being the pair of one white and one black line with the same width.