The invention concerns an optical instrument (1) for imaging fluorescence signals (7) from an arrangement of a plurality of individual detection sites, for example the wells of a microtitrc plate. In order to improve the light yield of the fluorescence excitation with excitation light (9) as well as the light yield of the detection of the fluorescence signals (7), an objective array (18) is proposed which is arranged in the beam path between the field lens and the detection sites and comprises a field lens array (19) with field lens array elements (20) and a pupil lens array (21) with pupil lens array elements (22). In order to improve the channel separation and suppress interfering light the objective array (18) preferably comprises a diaphragm array (23) with in each case two diaphragm openings (24, 25) per detection site.
