Microscope system (1) comprises an illuminating system (70) having an operating state in which the illuminating beam has a spectrum comprising an excitation band of a fluorescent dye and an observation system (2) having an operating state in which an observation beam path (33) has a spectrum in the observation beam guided in the beam path. The microscope system has a control device (3) which is configured to selectively switch the illuminating system and the observation system in a first operating state and in a second operating state. Preferred Features: An infrared blocking filter supported by a filter support (57) is arranged in the observation beam path.
