1. A microscope system for evaluating the continuous spectral composition of light from a device under test (DUT), comprising: a microscope; a detector for detecting light received in the microscope from the DUT; a dispersing prismatic device having a first position in which it is located between the DUT and the detector so that the light received by the detector which originates from the DUT is chromatically dispersed, the dispersing prismatic device being movable from the first position to a second position out of the path of light received by the detector from the DUT and wherein the dispersing prismatic device is a direct vision prismatic device.