When taking a picture of a waterfall with a 1 sec shutter speed?
You really need to go on a course and get this basic stuff. Under any lighting conditions there is only one level of light on the sensor that will give a correct exposure. Lets say on a bright day when your apertures is set at say f8, and your camera gives you a meter reading of 1/400th of a second, at f11 it will give you 1/200th of a second. On the second setting its giving you half the light for twice as long net result exactly the same amount of light falls onto the sensor. You want to shoot at 1 second which in photgraphic terms is a long time, so your aperture neeeds to be tiny, it sounds as if your camera lens smallest aperture is f20, but that may not be far enough to get 1 second shutter time with the light conditions as you found them. You have two courses of action you can wait till the light level goes down to the point that f20 WILL give you a shutter time of 1 second, or you can use ND (Neutral Density) filters, all these do is cut the light reaching the sensor down. They
