title: Line spread function formulation proposed by W. H. Steel: a revision.
abstract: A revised formulation of the image light distribution of an incoherent line source proposed by Steel [Rev. Opt. 31, 334-340 (1952)] is presented. Analytical and numerical results based on this new representation are given. We explicitly show that a major error in Steel's final expression generates singularities, thereby preventing convenient numerical computation.
authors.forename: A
authors.initials: A
authors.lastname: Manzanares
authors.forename: M L
authors.initials: ML
authors.lastname: Calvo
authors.forename: M
authors.initials: M
authors.lastname: Chevalier
authors.forename: V
authors.initials: V
authors.lastname: Lakshminarayanan