The history of our first stellar spectra with a fibre spectrograph started in 1993 with a test bench spectrograph. The configuration used at that time was the "crossed Czerny-Turned" design with spherical mirrors. This configuration was very compact but unfortunately generates high astigmatism. Since our spectra are limited by dark current noise and the spectrum spreads 10 to 14 pixels perpendicular to the dispersion, this configuration was abandoned. After some trials, we finally adopted the classical "textbook" layout but with an objective lens as camera to reduce all aberrations at a maximum. The result is shown in the figure below. Ponchado borned, which means robust or strong in familiar mexican language.
Our detector was a front illuminated CCD from Hale Research (UK)