DORIS III as a dedicated source for synchrotron radiation

In May 93 the operation of DORIS for high energy physics was discontinued and the ring became a dedicated source for synchrotron radiation operated at 4.5 GeV. Meanwhile a multibunch feedback system to control beam instabilities had been installed and positrons were stored instead of electrons. The resulting improvements and also the present status are described by discussing some important parameters and their limitations. These parameters include the beam lifetime, the maximum stored currents, the number of bunches, the beam dimensions and aperture, orbit distortions, position control of the photon beams, the reliability and the influence of the 10 insertion devices on the stored beam.