Telescope comprising: - a hollow body which, during use, is entered by light rays originating from an observed object, which hollow body comprises a casing component, - an optical system positioned in the hollow body to form, in a focal plane, an image of the observed object, which optical system comprises at least one mirror suitable for reflecting the light rays entering said body, - an adjusting device for adjusting the inclination and position of the mirror, characterized in that the adjusting device comprises: - a carriage mounted translationally mobile in the hollow body along the optical axis (A-A), - a support plate in which the mirror is fixed, which plate is secured to the carriage by means of an articulation that allows the inclination of said plate to be modified, - the carriage is translationally driven by means of a screw/nut mechanism, o the screw/nut mechanism can be actuated by means of an adjusting knob that can be grasped from outside the hollow body, which knob is engaged with the screw or the nut of said mechanism, o the adjusting knob is mounted rotationally mobile in the casing component of the hollow body, o the adjusting knob is arranged in relation to the screw/nut mechanism in such a way that turning said knob causes translational movement of the carriage, o the adjusting knob is associated with an end-stop member suitable for collaborating with a complementary end-stop member formed in the casing component so as to limit the turning of said knob and the movement of the carriage, - at least one actuator is mounted mobile in the carriage and that acts on the support plate so that movement of said actuator causes the inclination of said plate to be modified, which actuator can be actuated from outside the hollow body from the casing component. - a hollow body which, during use, is entered by light rays originating from an observed object, which hollow body comprises a casing component, - an optical system positioned in the hollow body to form, in a focal plane, an image of the observed object, which optical system comprises at least one mirror suitable for reflecting the light rays entering said body, - an adjusting device for adjusting the inclination and position of the mirror, - a carriage mounted translationally mobile in the hollow body along the optical axis (A-A), - a support plate in which the mirror is fixed, which plate is secured to the carriage by means of an articulation that allows the inclination of said plate to be modified, - the carriage is translationally driven by means of a screw/nut mechanism, o the screw/nut mechanism can be actuated by means of an adjusting knob that can be grasped from outside the hollow body, which knob is engaged with the screw or the nut of said mechanism, o the adjusting knob is mounted rotationally mobile in the casing component of the hollow body, o the adjusting knob is arranged in relation to the screw/nut mechanism in such a way that turning said knob causes translational movement of the carriage, o the adjusting knob is associated with an end-stop member suitable for collaborating with a complementary end-stop member formed in the casing component so as to limit the turning of said knob and the movement of the carriage, o the screw/nut mechanism can be actuated by means of an adjusting knob that can be grasped from outside the hollow body, which knob is engaged with the screw or the nut of said mechanism, o the adjusting knob is mounted rotationally mobile in the casing component of the hollow body, o the adjusting knob is arranged in relation to the screw/nut mechanism in such a way that turning said knob causes translational movement of the carriage, o the adjusting knob is associated with an end-stop member suitable for collaborating with a complementary end-stop member formed in the casing component so as to limit the turning of said knob and the movement of the carriage, - at least one actuator is mounted mobile in the carriage and that acts on the support plate so that movement of said actuator causes the inclination of said plate to be modified, which actuator can be actuated from outside the hollow body from the casing component.