optical telescope observing architecture and especially for observing the earth from a satellite

observation telescope optical architecture free central shutter, in particular for telescopes intended to be installed on board a vehicle such as a space satellite, for purposes of observation zonal terrestre.Elle comprises - a mirror (5), aspherical or possibly spherical, concave and cut off-axis, which reflects a convergent manner the beam consisting of radiation that it receives from a terrestrial area that observed; - an aperture correction plate (6), dioptric, achromatic and athermal preferably inserted on the path of the convergent beam reflected by the mirror, - a field correction plate (8) diopter, preferably achromatic and athermal, inserted in the beam path convergent reflected by the mirror, downstream of the aperture correction plate relative to miroir.- a pupil (7) positioned on the beam path converging reflected at the corrector ouverture.Elle allows to simply ensure a decision stereoscopic view.