1. A method of observing features of an object, comprising: illuminating an object with fluorescence-excitation radiation, fluorescent emissions stimulated by such illumination characterized by a plurality of ultraviolet wavelengths; forming from said fluorescent emissions a plurality of superposed fluorescent images of said object by means of a single broadband collector, and detecting the images so formed, the detected images being in separate wavelength bands including a plurality of ultraviolet wavelength bands distributed over at least a 50 nm range of wavelengths, said fluorescent images formed by said collector having a substantially identical image size for every detected wavelength band including the plural ultraviolet wavelength bands; and observing features on said object by using said plurality of detected fluorescent images.