OSLO uses the term Zoom lens to refer to a system in which the thicknesses (spacings) between elements or element groups can have multiple values to achieve variable magnification. OSLO Standard contains routines needed for optimization of zoom lenses. OSLO Premium contains, in addition, routines for optimizing systems where practically any type of data can assume multiple values. Such systems are called multiconfiguration systems. Each configuration can be assigned a relative weight, activated/deactivated , be assigned different system data (evaluation mode, field points, ray set...). OSLO Premium also includes skip surfaces for systems containing beam splitters and multiple beam paths.
Several features have been added to Rev. 6 to improve the power and usability of OSLO for zoom and multiconfiguration design: