Device for determining the optical properties of samples in different operating modes, comprising: a light source; a photosensitive detector; a first excitation path for transmission of light from the light source as an excitation light from above into a first measurement position in which a sample container including a sample is arranged or arrangeable; a first emission path for transmission of emission light emitted by the sample from a top side of the sample to the detector; a selective beam deflector device arranged above the first measurement position for separation of the first excitation path from the first emission path; a second excitation path for transmission of light from the light source as an excitation light from below into a second measurement position in which a sample container including a sample is arranged or arrangeable; a second emission path for transmission of emission light emitted by the sample from a bottom side of the sample to the detector; devices for switching over between a first operating mode and a second operating mode, wherein in the first operating mode the first excitation path and the first emission path and in the second operating mode the second excitation path and the second emission path are usable, wherein the second emission path includes a first partial path which leads from an input head belonging to the device and arranged below the second measurement position for emission light emitted from the bottom side of the sample while bypassing the first measurement position to a coupling device belonging to the device for coupling of emission light into the first emission path, characterized by an emission filter carrier device capable of being switched over between multiple operating positions for selective filtering of emission light prior to entering into the detector, wherein the emission filter carrier device is configured as a coupling device capable of being switched over for optional coupling of emission light from the first partial path into the first emission path. a light source; a photosensitive detector; a first excitation path for transmission of light from the light source as an excitation light from above into a first measurement position in which a sample container including a sample is arranged or arrangeable; a first emission path for transmission of emission light emitted by the sample from a top side of the sample to the detector; a selective beam deflector device arranged above the first measurement position for separation of the first excitation path from the first emission path; a second excitation path for transmission of light from the light source as an excitation light from below into a second measurement position in which a sample container including a sample is arranged or arrangeable; a second emission path for transmission of emission light emitted by the sample from a bottom side of the sample to the detector; devices for switching over between a first operating mode and a second operating mode, wherein in the first operating mode the first excitation path and the first emission path and in the second operating mode the second excitation path and the second emission path are usable, wherein the second emission path includes a first partial path which leads from an input head belonging to the device and arranged below the second measurement position for emission light emitted from the bottom side of the sample while bypassing the first measurement position to a coupling device belonging to the device for coupling of emission light into the first emission path, characterized by an emission filter carrier device capable of being switched over between multiple operating positions for selective filtering of emission light prior to entering into the detector, wherein the emission filter carrier device is configured as a coupling device capable of being switched over for optional coupling of emission light from the first partial path into the first emission path.