title: Direct determination of f-number by using Ronchi test.
abstract: A method to determine f-number for an imaging system is discussed. This method uses Ronchi test and is different in that the value of f-number of the system can be determined without depending on any particular parameters. Two different sizes of aperture for a common system were investigated and the corresponding f-numbers were compared with those calculated by a lens design software. In addition, the determined f-numbers are proved to be consistent with other values obtained in this study.
authors.affiliation: Department of Physics, Inha University, Incheon, Republic of Korea. smlee@inha.ac.kr
authors.forename: Sukmock
authors.initials: S
authors.lastname: Lee