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Originally Posted by QTbucks_Mark
What you're talking about is called "depth of field" - it's mainly affected by the aperture you use.
You get that effect by having the lens wide open (high f-stop number, small aperture size). If you set your camera to use a large aperture (f/32) you'll get a very high depth of field and almost everything will apear sharp and in focus. You'll also need WAY more light, as the aperture will let almost no light trough.
You can adjust those setting on any semi-pro camera (digital SLR) and also on some camcorders (at least I can on my FX1). The range of f-stops you can set depends on the lens you use - the better the lens, the higher the range.
If you want some in-depth knowledge, there is a great article in Wikipedia you can use for a start.
Hope this helps |
A another way to explain Depth of field .. is the distance from the front Focal Lens to the back image plain .. with should be greater or equal to the distance to the subject in realtion to it's background ...
In other words .. stand at 4 feet from the subject, whilts the Bcakground is at least double that distance .. Focus on the subject only . this will throw the background out ...
Or .. Use the Portrait setting available on most Digital cameras .. even the cheap ones