title: Rigid endoscopic relay systems: a comparative study.
abstract: Relay systems in rigid endoscopes can compensate for aberrations in the objective and the eyepiece. Five classes of rigid relay systems are examined: conventional; glass Hopkins; plastic lens, glass-rod Hopkins; modified Hopkins; and gradient index. First-order theory, including achromatization, is developed for these systems. Design results are presented, and aberration, vignetting, and system length trade-offs are analyzed.
authors.forename: T H
authors.initials: TH
authors.lastname: Tomkinson
authors.forename: J L
authors.initials: JL
authors.lastname: Bentley
authors.forename: M K
authors.initials: MK
authors.lastname: Crawford
authors.forename: C J
authors.initials: CJ
authors.lastname: Harkrider
authors.forename: D T
authors.initials: DT
authors.lastname: Moore
authors.forename: J L
authors.initials: JL
authors.lastname: Rouke