Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan It is reported the results of an observational run carried out with the JKT telescope of 1m at La Palma Observatory, which allowed to obtain the near-IR intermediate resolution spectroscopy of the spectral region at ~8500A, which include the CaII triplet, for an extensive sample of ~500 stars that cover a very wide range in temperatures, gravities and metallicities. The observations are aimed at building new stellar population synthesis model predictions which allow to analyze the CaII feature in external galaxies. It is studied the well known sensitivity of this feature to the initial mass function (IMF) as well as its behavior as a function of the age and metallicity for integrated spectra. Nowadays such a kind of telescopes are nearly forgotten, however, we see that this is an example of how these telescopes are still very useful, particularly, for performing a fundamental type work which is required for the interpretation of the key stellar population parameters in external galaxies. In fact the results of this observational run is mainly devoted to study the dwarf/giant ratios in field and cluster galaxies as well as globular clusters systems in external galaxies, which can be carried out at modern telescope installations such as SUBARU.