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Depth of Field Calculator
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Depth of Field Definition
Hyperfocal, near, and far distances are calculated using these equations.
Circles of confusion for digital cameras are listed here.
Depth of Field (DOF) is the range of distance in a photo that appears to be in sharp focus ... Depth of field is a creative decision and one of your most important choices when composing nature photographs.
Nature Photography Photo Workshop, Nat Coalson, 2011
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Simply put, depth-of-field is how much of a photograph is in sharp focus from front to back.
Digital Landscape Photography: In the Footsteps of Ansel Adams and the Masters, Michael Frye, 2010.
We can achieve critical focus for only one plane in front of the camera, and all objects in this plane will be sharp. In addition, there will be an area just in front of and behind this plane that will appear reasonably sharp (according to the standards of sharpness required for the particular photograph and the degree of enlargement of the negative). This total region of adequate focus represents the depth of field.
The Camera (Ansel Adams Photography, Book 1), Ansel Adams, Tenth Edition, 1995
Hyperfocal Distance Definition
... the hyperfocal distance setting ... is simply a fancy term that means the distance setting at any aperture that produces the greatest depth of field.
How to Use Your Camera, New York Institute of Photography, 2000.
If you set the camera's focus to the hyperfocal distance, your depth of field will extend from half of the hyperfocal distance to infinity—a much deeper depth of field.
Complete Digital Photography, Ben Long, 2012.
Another important control for landscape photography is depth of field, the amount of sharpness in a scene, from close to the camera into the distance away from the camera. It's sharpness in depth.
Landscape Photography: From Snapshots to Great Shots, Rob Sheppard, 2012.