 Mike W. Stoker |
How to Keep Two Objects in Focus I am just a newbie!!! I am having trouble trying to keep two objects in focus. Example: with my wife standing on the Golden Gate and San Francisco in the background, the camera will focus on only one object. What am I doing wrong?
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Jon Close |
If you have a full auto point & shoot camera there isn't much you can do. If you have an SLR then you have more control over your pictures. The depth of focus or depth of field is controlled by the lens aperture. In general, smaller apertures (i.e. higher f-numbers) give greater depth of field. Associated with this is the hyperfocal distance. For each lens focal length and aperture setting there is a focus setting such that all objects from x to infinity appear in focus. Here is a link to one hyperfocal calculator For example, (assuming 35mm film) a 50mm lens set to f/16 and focused at about 17 feet will give depth of field from 8.5 feet to infinity. Manual focus lenses used to have depth of field scales printed on them, but the construction of zooms and autofocus lenses makes that more difficult. It is rare to find DOF scales on modern AF lenses. There is a free download of an program for creating custom DOF scales to use with your lenses. Canon EOS cameras have a DEP (Depth of Field) auto exposure program. Set the control to DEP, focus the camera to the nearest and then the farthest objects you want in focus, and the camera will select the proper aperture. Other brands may have a similar program.
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