An optical system for a remote sensing satellite comprising: a first lens configured to receive incoming light from an object; a first mirror comprising a central aperture, the first mirror configured to refract the light from the first lens through a first surface of the first mirror, reflect the light at a second surface of the first mirror, and refract the light reflected from the second surface of the first mirror that is exiting the first mirror at the first surface of the first mirror; a second mirror configured to receive the light from the first mirror, wherein the light is refracted through a second surface of the second mirror towards a first surface of the second mirror where the light is reflected back towards the second surface of the second mirror and refracted by the second surface upon exiting the second mirror; a negative corrector lens configured to refract the light from the second mirror through the central aperture of the first mirror; and a positive corrector lens configured to receive the light through the central aperture of the first mirror and refract the light to an imaging surface, wherein the first lens, the first mirror, the second mirror, the negative corrector lens, and the positive corrector lens are positioned along an optical axis of the optical system, characterized in that the optical system comprises: a housing (300, 301) comprising a forward portion and a back focal length portion wherein the forward portion comprises the first lens, the first mirror, the second mirror and the negative corrector lens, wherein the back focal length portion spans the distance from the end of the forward portion to the imaging surface, and wherein the positive corrector lens is placed in the back focal length portion; wherein a first distance between the first lens and the first mirror is less than one third of a total track length of the optical system, and wherein the back focal length portion of the housing has a diameter that is no more than half of a largest diameter from the first lens and the first mirror. a first lens configured to receive incoming light from an object; a first mirror comprising a central aperture, the first mirror configured to refract the light from the first lens through a first surface of the first mirror, reflect the light at a second surface of the first mirror, and refract the light reflected from the second surface of the first mirror that is exiting the first mirror at the first surface of the first mirror; a second mirror configured to receive the light from the first mirror, wherein the light is refracted through a second surface of the second mirror towards a first surface of the second mirror where the light is reflected back towards the second surface of the second mirror and refracted by the second surface upon exiting the second mirror; a negative corrector lens configured to refract the light from the second mirror through the central aperture of the first mirror; and a positive corrector lens configured to receive the light through the central aperture of the first mirror and refract the light to an imaging surface, wherein the first lens, the first mirror, the second mirror, the negative corrector lens, and the positive corrector lens are positioned along an optical axis of the optical system, characterized in that the optical system comprises: a housing (300, 301) comprising a forward portion and a back focal length portion wherein the forward portion comprises the first lens, the first mirror, the second mirror and the negative corrector lens, wherein the back focal length portion spans the distance from the end of the forward portion to the imaging surface, and wherein the positive corrector lens is placed in the back focal length portion; wherein a first distance between the first lens and the first mirror is less than one third of a total track length of the optical system, and wherein the back focal length portion of the housing has a diameter that is no more than half of a largest diameter from the first lens and the first mirror.