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Using HST ACS/WFC images, we derive the color--magnitude diagram of the old,metal-rich open cluster NGC 6791 to nearly 29th magnitude in V, which is theneighborhood of the hydrogen-burning limit.Comparison with isochrones leads toa discussion of the distance modulus, the reddening, and the age of thecluster. By making a statistical correction for field stars we derive apreliminary luminosity function, and a very tentative mass function. The whitedwarf sequence is clearly shown, and has been discussed in a separate paper.Comment: 21 pages, 8 figures. Accepted (25 April 2005) on AJ, in press for the  August issu

Color-Magnitude Diagrams and Luminosity Functions Down to the Hydrogen-Burning Limit. III. A PreliminaryHubble Space TelescopeStudy of NGC 6791