The triple band filter sets were designed for simultaneous viewing of three fluorochromes. Each excitation filter contains three passbands for simultaneous excitation. Concurrently each emission filter contains three passbands for simultaneous viewing. The polychroic beamsplitters contain complementary reflection and transmission bands specific to the excitation and emission filters. Like the dual band series, these sets were originally designed for FISH (fluorescence in situ hybridization). Also like the dual band sets these filter sets have shown great practicality for other applications.