Lunch atop a (Springfield) skyscraper

Lunch atop a (Springfield) skyscraper
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Depth of Field: We adjust focus to a specific distance to obtain a sharp image. Practical experience reveals that objects before and after the distance focused upon, reproduce acceptably sharp. This zone of acceptable focus is what we call depth-of-field (DOF). What determines if an image is acceptable as to sharpness? The lens projects an image of the ...


"Focus Area" as you call it can also be called the Depth of Field. f/1.8 will always give a very narrow depth of field and would not be desirable for large groups of people. From 10 feet away only an area 1.68 feet would be in focus when using a 35mm lens on a crop camera body. Depth of Field calculations can be complex, and will always vary with the ...

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