title: Interferometer errors due to the presence of fringes.
abstract: Phase-shifting interferometry permits analysis of complex interferograms. However, the measurement accuracy is reduced as the number of fringes is increased. The wave-front from a defocused spherical surface is used to demonstrate this degradation for several different transmission reference objectives.
authors.forename: A E
authors.initials: AE
authors.lastname: Lowman
authors.forename: J E
authors.initials: JE
authors.lastname: Greivenkamp