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Digital Vs. Analog The traditional analog world was easy to understand. Negatives and prints were continuous tone and one simply made an enlargement from the negative or transparency to the size needed. Today, in the digital environment, many newcomers get-tripped up by the concepts of input and output resolution and terribly confused as to what settings to use, and when. To understand these issues clearly one needs to start with an acceptance of certain physical limitations of the human eye.
One of the skills that separates novice photographers from the more experienced is an awareness and control over “Depth of Field” (commonly referred to by its abbreviation “DOF”). Sometimes, to get the shot, we need to use a very small aperture. When we do, not only is the subject in sharp focus, but features in the background and/or foreground can compete for attention.