Some research that demonstrates shallow depth of field, drop focus technique, what a wide angle image looks like in comparason to a normal image. What a wide and tele photo image looks like and the lenses and lastly demonstation of high shutter speed image (to freeze action) and slow shutter speed for motion blur effects.
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Here is an image demonstrating shallow depth of feild. Basicly where the main subject of interest is enhanced throwing other elements out of focus.
shallow depth of field is used quite allot in commercial photography such as food, accesories, fashion etc. I imagine the reason for this being the actual product standing out more to the buyer it being in focus and the its surrounding out of focus.
Here are a few pointers on depth field technique what helped me understand the concept a bit better.
You choose the depth of field.
Choosing the amount of depth of field is key in photography. When shooting a landscape, for example, you'll want as much of the photograph as possible to be in sharp focus, so a large depth of field is required, as in the upper illustration in the figure below. In other situations, as in taking a portrait, a shallower area of sharp focus will separate your subject from distracting backgrounds, as in the lower diagram.
Illustration of DOF, showing large depth of field, upper diagram and shallow depth of field, lower diagram.
There are three factors which control the depth of field in a photograph:
Here are two examples of the difference of a telephoto lense and a normal standard lense.
Example: Normal Lens (50mm f/1.4)
Example: Wide Angle Lens (24mm f/2.8)
Here are two examples of images shot at a high shutter speed to freeze action and a low shutter speed to create light trails or to create movement.
Slow shutter speed for motion blur effects.
And a fast shutter speed to freeze action.
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