New PDF release: Advanced Photography, Sixth Edition

By Michael Langford

ISBN-10: 0240514866

ISBN-13: 9780240514864

The past due Michael Langford was once probably the most well-liked and acomplished authors of images essays. His works are unequalled of their analitical intensity, specialise in the elemental principals and mechanisms in images, but additionally of their severe educational procedure at the subject.
complicated images including its better half quantity simple images are for my part actually important resource of good written, instructive details, overlaying approximately each point of the photographic process.
at the moment the place there's stifling overabundance of shallow, uninspiring and downright dead "textbooks", that are not able to coach you whatever, complex images and uncomplicated images stand as usual atmosphere, distinct tutorials. Very hugely recomended.

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Extra resources for Advanced Photography, Sixth Edition

Example text

This is done by adjusting the camera settings correctly, providing that the range of tones in the subject is not too great. Further to the right (fig. 2-6) is a section of the curve that appears to be a straight line. Note that in many cases there will not be a well-defined straight line. This section of the curve has a constant slope, and in addition, the gradient of the slope here is greater than in any other part of the curve. In the straight-line section of the characteristic curve, there is an equal increase in density for an equal increase in exposure.

2-6). The latitude of an emulsion, therefore, determines the brightness range of the subject that can be reproduced proportionally. Latitude may be expressed either as the difference in log-H values between the two extreme points of the straight line or as the exposure ratio between these same two points. The emulsion latitude of light-sensitive materials varies according to the purpose for which it was designed—from 1:400 or more for long-scale panchromatic film, and from 1:20 or less for process film.

Therefore, you may need a filter to alter the color of the lamp, so it is equivalent to the spectral energy of sunlight. Differences in time can also lead to errors due to reciprocity law failure. The EG&G sensitometer, used commonly in Navy imaging facilities, permits you to change the exposure times as well. The exposure can be changed from 1/100 second to 1/10,000 second. This allows you to test the reactions of emulsions to various exposure times. A sensitometer is used to produce a logarithmically graded series of exposures with values that are already known.

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Advanced Photography, Sixth Edition by Michael Langford


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