The CHEOPS telescope tube and optical bench
The flat, black surface at the rear of the CHEOPS telescope tube is the optical bench onto which the focal plane module, containing the CCD detector, will eventually be mounted. A silver-coloured, metal section of the back-end optics can be seen protruding from the centre of the optical bench and pointing upwards. Starlight will be fed by the back-end optics from the secondary mirror to the detector.
The picture was taken at Leonardo-Finmeccanica, after integration of the telescope.