Low deformation telescope comprising: - a primary mirror having a reflecting front face, a rear face, and a peripheral edge externally connecting the front and rear faces; - a support extending on a same first side of the primary mirror as the front face; - a secondary mirror which is smaller than the primary mirror and is held rigidly by the support in front of the front face; - three fixing portions located on a same second side of the primary mirror as the rear face, and adapted to fix the telescope by said second side on a base external to said telescope; and - three rigid connections connecting the support respectively to the three fixing portions, through the primary mirror and at a distance from the peripheral edge towards a central area of said primary mirror, and each rigid connection being further connected to the primary mirror laterally with respect to a direction of connection of the support to the fixing portion relative to said rigid connection, the three rigid connections each passing through the primary mirror between the reflecting front face and the rear face respectively at three locations in the reflecting front face separated from each other, and each rigid connection connecting the support to the respective fixing portion independently of the primary mirror, characterised in that each rigid connection being connected to the primary mirror by means of a gimbal (6a-6c) with solid deformation, the rigid connection being integral with an internal stage of the gimbal, and an external stage of each gimbal being integral with the primary mirror, the primary mirror and each gimbal (6a-6c) form a single piece made of a single solid material which is continuous between said primary mirror and the internal stage of said gimbal; and primary mirror has a slot (7a-7c) which extends around each rigid connection and transversely to the direction of connection of the support to the fixing portion relative to said rigid connection, and the slot is located between the gimbal (6a-6c) relative to said rigid connection and the front face of the primary mirror. - a primary mirror having a reflecting front face, a rear face, and a peripheral edge externally connecting the front and rear faces; - a support extending on a same first side of the primary mirror as the front face; - a secondary mirror which is smaller than the primary mirror and is held rigidly by the support in front of the front face; - three fixing portions located on a same second side of the primary mirror as the rear face, and adapted to fix the telescope by said second side on a base external to said telescope; and - three rigid connections connecting the support respectively to the three fixing portions, through the primary mirror and at a distance from the peripheral edge towards a central area of said primary mirror, and each rigid connection being further connected to the primary mirror laterally with respect to a direction of connection of the support to the fixing portion relative to said rigid connection, the three rigid connections each passing through the primary mirror between the reflecting front face and the rear face respectively at three locations in the reflecting front face separated from each other, and each rigid connection connecting the support to the respective fixing portion independently of the primary mirror,