Are there shutter-priority and aperture-priority modes?
Yes. With the “Auto Lock” switch in the center position, press the button on back labelled “Program” to set AES or AEA. AES mode lets you set the shutter speed (1/60 – 1/10,000 sec) and aperture is set automatically. AEA mode lets you set aperture (f/1.6 – f/11) and the shutter is set automatically. These settings operate in both video and still-frame modes. You can select shutter speeds down to 1/4 sec (1/3 sec PAL) only by using the separate “Shutter speed” button, and this works only in video mode, not still (memory) mode. Since changing shutter speed changes the look of the video, it is usually best to use only the standard 1/60 (1/50 PAL) shutter and change aperture (and/or use internal or external ND filters) to match the lighting conditions. This is the default “auto exposure” mode of the camera, which works well in most cases.