Telescope comprising at least one primary mirror (M1) and a secondary mirror (M2), and adapted to form, when the telescope is used, an image in a focal plane (PF) with reception light rays (Rx) that are reflected by the primary mirror and then by the secondary mirror towards the focal plane, said secondary mirror being oriented perpendicularly to an optical axis (A-A) of said telescope, the primary mirror (M1) being provided with a first hole (T1) at an intersection of the reflecting surface (S1) of said primary mirror with the optical axis (A-A), so that the reception light rays (Rx) that form the image in the focal plane (PF) pass through the first hole through the primary mirror after having been reflected by the secondary mirror (M2), and the secondary mirror (M2) being provided with a surface alteration at an intersection of a reflecting surface (S2) of said secondary mirror with the optical axis (A-A), said surface alteration being adapted so that light rays (Tx0) that originate from the focal plane (PF) of the telescope and which arrive at the surface alteration of the secondary mirror by passing through the first hole (T1) through the primary mirror (M1) are at least partly prevented from being reflected by said secondary mirror towards said focal plane, the telescope being characterised in that it further comprises at least one lens arranged on a path of the reception light rays (Rx) that form the image in the focal plane (PF), downstream of the secondary mirror (M2) in a direction of propagation of said reception light rays, said lens having two optical surfaces that intersect the optical axis (A-A) of the telescope, each of both optical surfaces of the lens forming with the optical axis an angle that is different from 90° at a point of intersection of said optical surface of the lens with the optical axis. the primary mirror (M1) being provided with a first hole (T1) at an intersection of the reflecting surface (S1) of said primary mirror with the optical axis (A-A), so that the reception light rays (Rx) that form the image in the focal plane (PF) pass through the first hole through the primary mirror after having been reflected by the secondary mirror (M2), and the secondary mirror (M2) being provided with a surface alteration at an intersection of a reflecting surface (S2) of said secondary mirror with the optical axis (A-A), said surface alteration being adapted so that light rays (Tx0) that originate from the focal plane (PF) of the telescope and which arrive at the surface alteration of the secondary mirror by passing through the first hole (T1) through the primary mirror (M1) are at least partly prevented from being reflected by said secondary mirror towards said focal plane, the telescope being characterised in that it further comprises at least one lens arranged on a path of the reception light rays (Rx) that form the image in the focal plane (PF), downstream of the secondary mirror (M2) in a direction of propagation of said reception light rays, said lens having two optical surfaces that intersect the optical axis (A-A) of the telescope, each of both optical surfaces of the lens forming with the optical axis an angle that is different from 90° at a point of intersection of said optical surface of the lens with the optical axis. <EOS>