An endoscope (100) is described in which the diameter of the image relay assembly (110) is less than that of the objective lens assembly (106). An endoscope sheath (200) is also described for sheathing the endoscope (100) and housing or directing optical fibers (218) for use in illuminating the endoscope field of view. An endoscope-sheath system (300) is further described comprising the combination of the endoscope (100) and the endoscope sheath (200).Linvention concerne un endoscope (100) dans lequel le diamètre de lensemble relais dimage (110) est inférieur à celui de lensemble objectif (106). Par ailleurs, linvention concerne une gaine dendoscope (200) qui protège lendoscope (100) et qui enveloppe ou oriente les fibres optiques (218) utilisées pour éclairer le champ de vision de lendoscope. Un système gaine/endoscope (300) associe lendoscope (100) et la gaine dendoscope (200).
