1. A broadband spectrometer apparatus for field use comprising: (a) a spectrometer means for dispersing radiation into its component wavelengths including: a collecting optics having a first numerical aperture for collecting electromagnetic energy and for focusing the collected electromagnetic energy according to the first numerical aperture, a fiber optics reformattor having a plurality of fibers arranged to form a front face forming a field stop for receiving the focused electromagnetic energy and a back face forming an entrance slit for the spectrometer means, and each single fiber optic of the plurality of fiber optics at the back face has a second numerical aperture having a mathematical relation to the first numerical aperture such that a value for the second numerical aperture is larger than the value of the first numerical aperture, the fiber optics reformattor being for reformatting the received and focused electromagnetic energy and a means for dispersing the focused and reformatted electromagnetic energy into component wavelengths; and (b) detector means operatively connected to the spectrometer means for detecting the reformatted, received, dispersed and focused electromagnetic energy to obtain the dispersed radiation component wavelength thereby.