"' Depth of focus "'is a lens optics concept that measures the tolerance of placement of the image plane ( the film plane in a camera ) in relation to the lens.
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They seek to improve near vision in one of three ways : changing the central refractive index, increasing the depth of focus through the use of a pinhole, and reshaping the central cornea.
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In most cases, the image distance ( not to be confused with subject distance ) is not easily determined; the depth of focus can also be given in terms of magnification " m ":
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As I was reading about the Edsel, this image stood out, because its depth of focus ( am I saying this correctly ? ) makes the car " pop " against the greyish, out-of-focus background.
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Where depth of field often can be measured in macroscopic units such as meters and feet, depth of focus is typically measured in microscopic units such as fractions of a millimeter or thousandths of an inch.
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In other words, the smaller the aperture ( giving greater depth of focus ), the less light coming in, so the length of time has to be increased ( leading to possible blurriness if motion occurs ).
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As an example, a Kodak Aero Ektar 178 mm f / 2.5 lens can be fitted to Speed Graphic 4x5 cameras and used to take soft / sharp photographs with complete control of the depth of focus.
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Characters are depicted interacting with and moving around within their environment; to this effect, Visconti favors long and ponderous shots while making use of depth of focus to highlight the variety of action occurring throughout the space of the frame.
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The concepts of the two definitions of hyperfocal distance have a long history, tied up with the terminology for depth of field, depth of focus, circle of confusion, etc . Here are some selected early quotations and interpretations on the topic.
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The successful emergence of immersion lithography comes not just from its ability to extend resolution and depth of focus, but also from its timely introduction to the industry ( e . g ., IBM, AMD ) between 65 nm and 45 nm nodes.
