An important difference between most Acousto-optical (AO) and imaging systems is coherent vs. incoherent light. The Transfer Functions in the presence of the primary aberrations underscore these differences. Two AO types, the Acousto-Optical Tunable Filter (AOTF), and the Acousto-Optical Dispersive Light Filter (AODLF), accept incoherent light. The AOTF is an electronically programmable monochromator. The AODLF is an agile spectrometer which, can be used with wide angle optics to comprise an unusual optical system.