There are three basic facts to Depth Of Field. Holding everything else equal:
1. DOF increases as a lens is stopped down (i.e., the f/number is increased)
2. DOF increases as focal length decreases
3. DOF increases with subject distance.
Experienced photographers
attempt to manipulate these factors in order to control how much of the background and foreground blurs and how strong the blur will be. There are images that should be sharply focused throughout. Landscapes are usually shot with tiny apertures like f/11 and f/18 to have everything in focus from a few feet in front of the
photographer all the way to the horizon. At other times, a blurred background or foreground is preferred. When you take a macro or near-macro shot, the DOF can be as small as a fraction of an inch. Make a mistake and either the front or the back of your subject will show evidence of being out of focus.
Most of the times we initially click small objects, those situations where DOF works against you, where a sharply focused subject means competing features in the background or foreground will also be brought into relative sharpness and detract from the subject.
No comments:
Post a Comment