PJ... they are intended for videography solely but can't hurt stills... when you are filming at 24 fps and looking to get that cinematic look and feel, the ND's are an absolute requirement. Go with the darkest filter, the ND8 on bright sunny days, step down to the ND4 on cloudy days and at dusk or indoor, no filter is needed. Your video will improve greatly as the shutter speed is adjusted to get rid of the "blur" and will also help if your props get in the shot, as the filters when they step down the cam, will cause the props to wash away to a large degree... BTW... go with Auto, unless your are trying to capture a specific effect and don't want the camera adjusting as the light changes...