PISCO can measure the position of close binaries in order to determine the orbits and derive the masses of the components using the parallaxes measured by Hipparcos (coll. M. Scardia and G. Mauro, (Merate Obs. Italy)).
It is also possible to measure the color indices of the companions with BVR imaging and constrain the spectral type of the stars for which a derivation of mass has been made.
The study of binaries is a well suited program for speckle cameras as the bibliography of the last two decades can easily show (CHARA project, McAlister and Hartkopf, 1984, 1988, Hartkopf et al., 1996). We noticed that PISCO was very efficient for binary study, even when the atmospheric conditions were not very good and did not allow undertaking any other imaging program. This is the reason why we used binary measurements as a backup program of all our high angular resolution observations.