In the picture, how these things would change for the best pictures?
ISO. I do not know what this means or not, but why I do low or high? My camera has a range of 64 to 1600 and after 6400 (but it does 4MEG pixels and not the usual 
opening. In what cases would to be low or high. My camera has a range of F2.8 to F8. The shutter speed. I have a basic idea of what it is. But why use a slow, no adjustment is necessary at par with others. My camera has a range of 4 "(I do not know what" stops, but low, with numbers without them, up to 1.3, then to 1 ", 1.3 ", 1.5", etc) for 2000. Thanks for your help!
ISO is a measure of sensitivity to light of a light sensitive surface, whether a film or digital sensor. A low ISO (64, 100) is very insensitive, but produces the best pictures, as there is very little digital noise or none. A high (400, 800, 1600) is more sensitive but digital noise becomes a problem around ISO 400 and up. We use a low ISO when shooting on a sunny day and when we want our quality of image to be high. In low light situations, like a cloudy day or when shooting without flash indoors or when shooting fast-moving outdoor action, we use an ISO high. Although our image quality will suffer with higher ISO is better to have the image with digital noise than no image. The opening, also called f-stop is a opening in the lens formed by the mobile leaves what is known as the diaphragm and determines how much light is admitted through the lens. The lower the number (f1.4, f2, f2.8), the largest opening and more light admitted. The higher the number (f5.6, F8, F11, F16), the smaller aperture and less light admitted. Shutter speed determines how long the light from the target is allowed to expose our film or digital sensor. The shutter speed also controls whether the movement the subject is sharp or blurred. A high shutter speed (1 / 250 sec., 1 / 500 sec.) It is necessary to "stop" the movement of the subject, while slow shutter speed (1 sec., 1 / 2 sec.) is used to blur the movement of water or other moving subjects to give a feeling of movement. Together, ISO, f-stop and shutter speed up the "Triangle of exposure." Here is a hypothetical table to show the relationship between shutter speed and aperture with a given ISO. These numbers can not be seen in reality, but the relationship holds. ISO 100 F1.4 @ 1 / 60 sec. F2 @ 1 / 30 sec. f2.8 @ 1 / 15 sec. F4 @ 1 / 8 sec. f5.6 @ 1 / 4 sec. f8 @ 1 / 2 sec. f11 @ 1 sec. F16 @ 2 sec. ISO 400 F1.4 @ 1 / 250 sec. F2 @ 1 / 125 sec. F2.8 @ 1 / 60 sec. F4 @ 1 / 30 sec. F5.6 @ 1 / 15 sec. F8 @ 1 / 8 sec. f11 @ 1 / 4 sec. F16 @ 1 / 2 sec. ISO 1600 f1.4 @ 1 / 1000 sec. F2 @ 1 / 500 sec. F2.8 @ 1 / 250 sec. F4 @ 1 / 125 sec. F5.6 @ 1 / 60 sec. F8 @ 1 / 30 sec. F11 @ 1 / 15 sec. F16 @ 1 / 8 sec. As you can see easily, with ISO led to "stop down" our f1.4 lens at F2 to f2.8 to f4, and so we admit less light and shutter speed is slowed in order to have time enough light to make a presentation. The 4 "is 4 seconds would be the minimum shutter speed. If I knew the brand and model camera would be easier to answer this part of your question. 2000 is the maximum shutter speed of the camera. You may want to purchase a copy of "Understanding Exposure" and "Understanding Shutter Speed, both by Bryan Peterson.
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