The present 18-mm active diameter proximity-focused microchannel plate (MCP) image tube design has been modified to produce significantly higher limiting spatial resolution. A glass input window of the "bulls-eye" design with the blackened glass border, reduced cathode-to-MCP spacing, reduced channel center-to-center distance, reduced MCP-to-phosphor screen spacing, a brushed P20 phosphor screen, and a fiber optic output window were used to achieve a limiting resolution in excess of 50 lp/mm. Test results, showing limiting resolution versus applied potentials, are correlated with a simple physical model of performance. The low-light-level white-light sine-wave modulation transfer function,
T(f), has been measured to be T(f) = exp[-(f/21.5)1.46], where f is the spatial frequency in cycles per millimeter.