A telescope system comprising - an entrance aperture for allowing light to pass into the telescope system at an entrance side of the telescope system; - an exit aperture for allowing the light pass out of the telescope system at an exit side of the telescope system; - optical components (M1-M7) configured to shape and guide the light along an optical path (L1-L8) inside the telescope system between and through the respective entrance and exit apertures (A1,A2), wherein a first part of the optical path (L1-L5) is determined by a first subset of the optical components (M1-M4) forming a first telescope stage of the telescope system, wherein a second part of the optical path (L6-L8) is determined by a second subset of the optical components (M6-M7) forming a second telescope stage of the telescope system, wherein the telescope system has an aperture stop (As) determined by a minimum opening limiting light passing between and through the entrance and exit apertures (A1,A2) of the telescope system via the optical components along the optical path (L1-L8); and - a steering mirror arranged in a part of the optical path (L5-L6) between the first telescope stage and the second telescope stage and configured to controllably rotate over a rotation angle (θm) for controlling a view angle (θv) of the telescope system from the entrance aperture, wherein the steering mirror is disposed at an intermediate pupil (Pi) of the telescope system, at which position an image of the aperture stop (As) is formed by one or more of the optical components (M7,M6) there between; wherein the first telescope stage comprises a first set of curved mirrors (M1-M4), wherein the curved mirrors (M1,M2,M3,M4) comprise at least one convex mirror having a negative focal length (f2<0), wherein a sum of inverse focal lengths (1/f1+1/f2+1/f3+1/f4) of the curved mirrors (M1,M2,M3,M4) is zero. - an entrance aperture for allowing light to pass into the telescope system at an entrance side of the telescope system; - an exit aperture for allowing the light pass out of the telescope system at an exit side of the telescope system; - optical components (M1-M7) configured to shape and guide the light along an optical path (L1-L8) inside the telescope system between and through the respective entrance and exit apertures (A1,A2), wherein a first part of the optical path (L1-L5) is determined by a first subset of the optical components (M1-M4) forming a first telescope stage of the telescope system, wherein a second part of the optical path (L6-L8) is determined by a second subset of the optical components (M6-M7) forming a second telescope stage of the telescope system, wherein the telescope system has an aperture stop (As) determined by a minimum opening limiting light passing between and through the entrance and exit apertures (A1,A2) of the telescope system via the optical components along the optical path (L1-L8); and - a steering mirror arranged in a part of the optical path (L5-L6) between the first telescope stage and the second telescope stage and configured to controllably rotate over a rotation angle (θm) for controlling a view angle (θv) of the telescope system from the entrance aperture, wherein the steering mirror is disposed at an intermediate pupil (Pi) of the telescope system, at which position an image of the aperture stop (As) is formed by one or more of the optical components (M7,M6) there between;