We complemented with data taken in transmission mode the recently described tests of the novel spectromicroscope MEPHISTO (Microscope a Emission de Photoelectrons par Illumination Synchrotronique de type Onduleur). Transmitted x rays were converted by a photocathode into photoelectrons, which were subsequently electron-optically processed by the spectromicroscope producing submicron-resolution images. Test images demonstrated excellent contrast. (C) 1998 American Institute of Physics. [S0034-6748(98)02409-5]