1. A method of producing a high resolution composite image using an imaging system, comprising: producing at least one first diffraction-limited image of a sample using at least one first point-spread function; producing at least one second diffraction-limited image of said sample using at least one second point-spread function; and subtracting said at least one first diffraction-limited image and said at least one second diffraction-limited image to produce said high resolution composite image having a third point-spread function, said subtraction produces a first lobe and a plurality of sidelobes of said third point-spread function, said sidelobes comprise a plurality of artifacts, said at least one first point-spread function comprises at least one focal spot and said at least one second point-spread function comprises at least one focal ring where the at least one second point-spread function is independently created from the at least one first point-spread function.