A light transit time camera system and method for operating such a system which can be operated with at least three modulation frequencies, having the steps a) determining a phase shift (φi) of an emitted signal (Sp1) and a received signal (Sp2) for a modulation frequency (f1, f2, f3) in a phase-measuring cycle (PM1, PM2, . . . ), b) carrying out a plurality of phase-measuring cycles (PM1, PM2, . . . ), c) determining a distance value (dn,n+1) on the basis of the phase shifts (φn, φn+1) determined in two successive phase-measuring cycles (PMn, PMn+1), in a distance-measuring cycle (M1, M2, . . . ), d) carrying out a plurality of distance-measuring cycles (M1, M2, . . . ), e) determining a distance deviation (Δd) between the distance values of successive distance-measuring cycles, f) outputting of a distance value (dn,n+1) as a valid distance value if the distance deviation (Δd) is within a tolerance limit (Δdtol) is provided.