2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2030We simulate multi-color surveys, which use the same telescope time on different filter sets of broad-band and medium-band filters. We use a photometric classification method for identifying stars, galaxies and quasars and for estimating multi-color redshifts of extragalactic objects. A library of >65000 color templates is used for comparison with observed objects. Spectroscopy from the CADIS survey has proven the performance of the method. We learned, that medium-band surveys perform superior to broad-band surveys in terms of classification and redshift estimation although they collect less photons. A full account of this work is already in print.6 pages, 2 figures, Proceedings of the conference held in Preston, UK, 21-24 August 2000Astrophysicstext