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FLEXO Magazine : October 2011
Depth of field determines how much of the photograph appears in focus or sharp. This area of focus is limited when there is not enough light to enable the use of smaller apertures. A smaller aperture allows for a larger depth of field (more of the photo in focus) and that requires light, sometimes a lot of light. Consumer cameras are counterproductive in this regard. They are biased toward using larger apertures and faster shutter speeds. You can photograph little Mikey on the tilt-a-whirl and main- tain good focus with minimal available light. The problem here is that not much other than little Mikey will be in focus, resulting in a blurry background. A “blurry background” could cause an additional problem if the image fades into a white background (no dots) or if a clip- ping path is used to clip colors at the edge of the blur. Because of tonal value increase in dot coverage, the edges where color drops below a minimum dot will appear “fake” or unnatural as the press gain produces a sharp and unnatural edge, ruining the intended effect. Depth of fielD, or AreA of ShArp focuS Factor: www.flexography.org october 2011 FLEXo 67