The opacities of aluminum, iron, and holmium were measured spectrally resolved in the energy range of 70 to 280 eV at typical densities and temperatures of about 0.01 g/cm{sup 3} and 22 eV, respectively. For this purpose the iodine laser ASTERIX IV (200 J/0.4 ns at 400 nm) was focused into a spherical gold cavity with a diameter of 3 mm. The generated radiation with a temperature of 60 eV heated thin tampered absorber foils which were probed by the radiation from a backlighter source. The experimental data are compared with theoretical opacity models. {copyright} {ital 1996 The American Physical Society.}