Successful photography is all about getting the image you envisage down on film. We must keep in mind that the photograph in the camera has been created as a two dimensional object. The image is created from line, shapes, shades and maybe color. These 3 or 4 elements combined with the focal length of the lens will create the Implied Image Depth. The focal length combined with the camera angle will manipulate this implied depth. Most people know this implied depth is called Perspective. There can be more than one vanishing point used to create the perspective, but we need only one for that to happen. Remember that without the use of at least one vanishing point there is no implied depth to the image. Perspective control of the image will be the reason you will want a selection of lenses with different focal lengths. This is one of the most significant aspects to using more than one lens with your camera.The real world exists in three dimensions. When the camera records these three dimensions down on to two-dimensional film the result is image perspective which can only imply depth. This image perspective comes from the camera optically converting this lost diminution. This is where the focal length comes in. No mater what the focal length it always ends up on the same size of film in your camera. Each Lens has a different angle of view. So the wider the angle of the lens the more compression takes place. Generally the wider the focal length the Greater the angle of view covered by the lens. At this point lets note the difference between the fore ground and its relationship to the back round in viewing angle. I will try to illustrate this fore ground, back round relationship. Also the way different angles of view affect the way these two points are represented on the film.
The foreground and background will occupy different percentages of the film dimensions.
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