When Auto is specified for camera sensitivity, DiMAGE 7 automatically adjusts the sensitivity to the light conditions.
For instance, when subject is dark or at flash photography, camera pulls up the sensitivity to avoid camera shake, or to increase the flash coverage.
When Auto is selected, either control of ISO 100, 200 or 400 is assigned accordingly under ambient light condition. The auto camera sensitivity is fixed at ISO 200 for flash photography, and at ISO 100 when M-mode is selected.