Spectrometer device and method for producing a spectrometer device

A method for producing a spectrometer device, with (i) an optical interference filter, which is configured to filter particular wavelength ranges of an incident light beam when it passes through the optical interference filter, (ii) a detector instrument, which is configured to detect the filtered light beam, and (iii) a focusing instrument having a reflective surface, comprising:

• arranging the focusing instrument, the detector instrument and the optical interference filter with respect to one another, using at least one spacer element which connects the focusing instrument to the optical interference filter and spaces them apart from one another, in such a way that the reflective surface of the focusing instrument reflects the filtered light beam onto the detector instrument in a focused manner, and the detector instrument is integrated into the optical interference filter, or arranged directly or indirectly on the interference filter, on a light exit side of the interference filter.