GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW) | ||||||
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05:08 Mar 26, 2004 |
English language (monolingual) [PRO] Tech/Engineering - Photography/Imaging (& Graphic Arts) | |||||||
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| Selected response from: Tony M France Local time: 01:30 | ||||||
Grading comment
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SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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5 +3 | rated at higher sensitivity... |
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3 +2 | artifically increased film speed by underexposing/overdeveloping |
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i use xx film, pushed one to two stops in-camera rated at higher sensitivity... Explanation: To 'push' a film in photography means to use it as if it were more sensitive (i.e. higher speed) than it actually is; this means that it will be theoretically under-exposed, which can be corrected later in the processing, etc. 'one or two stops' means by a factor of one or two f-stops --- the exposure indicating marks on the lens diaphragm, in practice, each stop represents a doubling (or halving, depending on whether you're opening or closing the iris) of the exposure. It means, for example, that the photographer exposes a 100 ASA film as if it were 200 ASA or even 400 ASA. The effect of this deliberate under-exposure will be (amongst others) to preserve highlight detail (whites, skies, etc.) whilst possibly sacrificing detail in shadow areas. There will also be a tendency to increased grain in the image, particularly if the 'pushing' is being corrected by means of 'forced' over development. |
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Grading comment
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