We report on BVI CCD photometry to V = 22.0 for 3 fields centered on the region of the Galactic star clusters Ruprecht 4 , Ruprecht 7 and Pismis 15 and on 3 displaced control fields .
Ruprecht 4 and Pismis 15 have never been studied before , and we provide for the first time estimates of their fundamental parameters , namely , radial extent , age , distance and reddening .
Ruprecht 7 ( Berkeley 33 ) however was studied by Mazur et al .
( 1993 ) .
We find that the three clusters are all of intermediate age ( 0.8-1.3 Gyr ) , and with a metallicity close to or lower than solar .