A telescope or riflescope with a central tube disposed between an objective lens and an eyepiece, wherein the central tube has a maximum outer diameter of 35 mm, - and wherein the central tube contains an erecting system with an integrated adjustable optical magnification means, wherein the erecting system and the optical magnification means are accommodated in one component and the erecting system comprises a first optical element and a second optical element, wherein the two optical elements (3a, 3b) are formed by lenses and are displaceable relative to one another, - wherein, by displacing the two optical elements (3a, 3b) of the erecting system, an intermediate image projected by the objective lens in an objective lens-end image plane with a variable reproduction scale and oriented upright with a more than fourfold magnification is projected in an eyepiece-end image plane, - characterized in that an optical beam deflector device formed by an additional lens arrangement is integrated as a third optical element in the erecting system, - wherein the beam deflector device is disposed at the end of the erecting system facing the eyepiece, - and wherein the erecting system is disposed between the objective lens-end image plane and the eyepiece-end image plane, wherein the objective lens-end image plane lies between the objective lens and the end of the erecting system facing the objective lens, and the eyepiece-end image plane lies between the eyepiece and the end of the erecting system facing the eyepiece, - and the beam deflector device is formed with a refractive power between -20 dpt (diopters) and -40 dpt, - and that the erecting system has a total focal length of at most 11 mm in the maximum magnification, at least for light with a wavelength of about 550 nm. - and wherein the central tube contains an erecting system with an integrated adjustable optical magnification means, wherein the erecting system and the optical magnification means are accommodated in one component and the erecting system comprises a first optical element and a second optical element, wherein the two optical elements (3a, 3b) are formed by lenses and are displaceable relative to one another, - wherein, by displacing the two optical elements (3a, 3b) of the erecting system, an intermediate image projected by the objective lens in an objective lens-end image plane with a variable reproduction scale and oriented upright with a more than fourfold magnification is projected in an eyepiece-end image plane, - characterized in that an optical beam deflector device formed by an additional lens arrangement is integrated as a third optical element in the erecting system, - wherein the beam deflector device is disposed at the end of the erecting system facing the eyepiece, - and wherein the erecting system is disposed between the objective lens-end image plane and the eyepiece-end image plane, wherein the objective lens-end image plane lies between the objective lens and the end of the erecting system facing the objective lens, and the eyepiece-end image plane lies between the eyepiece and the end of the erecting system facing the eyepiece, - and the beam deflector device is formed with a refractive power between -20 dpt (diopters) and -40 dpt, - and that the erecting system has a total focal length of at most 11 mm in the maximum magnification, at least for light with a wavelength of about 550 nm.