The general field of the invention is that of the optical checking ofoptical instruments of telescope type. The instrument (100) comprises anoptical objective (110), a photo-detection housing (120) arranged at the focusof said optical objective and at least one light source (121) arranged in thevicinity of said photo-detection housing, the optical pupil of the opticalobjective having a first diameter. The checking means essentially comprise aplane mirror (130) having a second diameter that is smaller than the firstdiameter and means making it possible to arrange this plane mirror in such away that the image of the light source given by the optical objective andreflected by said plane mirror is focused on the photo-detection housing,means for analyzing said image received making it possible to determine theoptical quality of the telescope. The plane mirror may be associated with anautonomous checking bench. It may also form part of the telescope and beincorporated into the protection hood (140) for the optic.
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