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Resolution has been shown to be an effective tool in the determination of the optimum exposure for graphic arts photosensitive materials. No international graphic arts standards are in existence specifying the line to space ratios for this kind of measurement. An earlier study of resolving power line to space ratios by Sandvik [12] indicated a linear relationship between resolving power and the log of this ratio when applied to photographic materials. Sigg [1] found that the line to space ratio differences were not significant for [Hydrazide type] halftone films. These Hydrazide materials are characterized by their high contrast and ability to reproduce fine lines. They are also characterized by their use of contagious development and therefore are atypical of other graphic arts films. Several difference microline containing control targets are currently available with 1:1, 3:7, and 1:9 line to space ratios. This paper examines the effect of different resolution line to space ratios of such targets when used to determine the optimum exposure for offset lithographic pre-press proof materials. Two types of pre-press proof materials were studied: those made by the use of toner powder deposition and those made by color containing pre-sensitized laminated systems. This paper examines the effect of different resolution line to space ratios of such targets when used to determine the optimum exposure for offset lithographic pre-press proof materials. Two types of pre-press proof materials were studied: those made by the use of toner powder deposition and those made by color containing pre-sensitized laminated systems.