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136 Depth of field (DOF) is probably one of the least understood principles of photography. Most photographers seem aware of its existence, but few seem able to define exactly how it works and how to put it to use. We believe that part of the reason for this is because it is completely fluid, (meaning constantly changing) element of the photographic process. It has no set parameter, so it is more difficult to define. It’s easy to define an f/stop, or a shutter speed, because once you set your camera it stays put. But, as a photographer, if you take so much as one step closer to your subject: the DOF has changed. Here is a definition of Depth of Field- In  optics , particularly as it relates to  film  and  photography ,  depth of field (DOF)  is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a  lens  can precisely  focus  at only one distance at a time, the d...