THE TRINITY OF PHOTOGRAPHY:
THE RELATIONSHIP BETWEEN SHUTTER SPEED, APERTURE SIZE (F-STOP) AND FILM SPEED.
The information in the following sections can be used as a photography primer for anyone with any camera. However, in order to learn how to take creative photos, you must have a camera that you can control. This means a camera with which you can choose the shutter speed, the f-stop and the film speed. Most 35mm cameras(Nikon, Canon, Minolta, Olympus Pentax etc.) can do this. Although an automatic point and shoot camera is useful for recording events, you have no control over it. It is therefore not a good camera for learning photography.
The shutter, is the part of the camera that opens and closes when you press the shutter release button. While the shutter is open, the scene you're taking gets passed to the film where it is recorded. The duration of time that the shutter stays open is referred to as the shutter speed. Shutter speeds are some of the numbers that you see in the viewfinder of most Single lens reflex cameras (SLRs) while you're composing your picture. These numbers range in value from as fast as 1/4000 of a second or more to as slow as 1 minute or more.The important thing to remember AND THIS WILL QUICKLY DEVELOP INTO A THEME is that these numbers work in a precise and predictable manner.