- As you can imagine, these three factors-apertures, depth of field, and subject distance-work together in any shooting situation. If you try to take a picture with an aperture of f/5.6.At a given distance from your subject, and at a given focal length, that f/stop will yield a certain depth of field. But what happens if you change the other two factors? If you get closer to the subject by zooming in, the depth of field decreases. Why do you have to care about depth of field at all? Answer is that depth of field is an extremely important element in the overall composition of your photographs.
- Using depth of field, you can isolate your subject by making sure it is the only sharply focused person or object in the frame. Alternately, you can increase depth of field tomake the entire image—from foreground to background—as sharp as possible.
The below example of sharply focused thing:
