i am considering buying the XZ-1 but since ISO 400 and higher smears the details i wonder if it possible to "lock" the iso at 100, let the camera adjust shutter automatically and control the aperture manually?
It is possible. Just set the camera in aperture mode and select ISO 100 from the camera's quick menu. The camera wont deviate from ISO 100 after you do this.
i am considering buying the XZ-1 but since ISO 400 and higher smears the details i wonder if it possible to "lock" the iso at 100, let the camera adjust shutter automatically and control the aperture manually?