%0 Journal Article %A Manzanares Ituarte, Ana %A Calvo Padilla, María Luisa %A Chevalier Del Río, Margarita %A Lakshminarayanan, Vasudevan %T Line spread function formulation proposed by W. H. Steel: A revision %D 1997 %@ 0003-6935 %U https://hdl.handle.net/20.500.14352/59074 %X 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. %~