BVRI CCD-photometry of comparison stars in the neighborhoods of galaxies with active nuclei. III

Observations with a matrix photometer are reported. The stellar magnitudes in the BVRcIc bands are estimated for 80 comparison stars in the neighborhoods of 10 galaxies with active nuclei: 2 Seyfert galaxies, 4 quasars, and 4 BL Lac objects. The stellar magnitudes of the observed stars range from 11 to 19^sup m^.5. For stars with magnitudes of 14-15^sup m^ the typical photometric errors are 0^sup m^.011, 0^sup m^.008, 0^sup m^.006, and 0^sup m^.007 in the B, V, R, and I bands, respectively. The BVRI magnitudes for most of these stars were not known previously. 14' × 14' finding charts for these stars are included. These results can be used for differential BVRI photometry of active galactic nuclei.[PUBLICATION ABSTRACT]