One of the programs conducted with the Bosscha Schmidt telescope is the study of loose star groupings and extended galactic clusters in the southern hemisphere (The 1963; Hidayat & Wiramihardja 1978; Hidayat et al. 1994). The aims of the study are, in short, to:
1. investigate or to confirm the physical reality of the loose groupings.
2. study the relationship between extended clusters or loose groupings with their environment.
3. derive their physical parameters which ultimately can be used to construct the luminosity functions of the objects.
The purpose of the present paper is to present one of our results for the extended cluster OCL 1104-584 (NGC 3532). The results of studies of loosegrouping objects taken from the list of Loden (1979) will be presented elsewhere.