Week 1 Notes

Week 1 Notes - Film Sensitometry 10/03/2008 07:02:00 What...

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Unformatted text preview: Film Sensitometry 10/03/2008 07:02:00 What is Sensitometry? Measurement of the properties of photographic emulsions by examination of the relationship between photographic density and exposure under controlled conditions of exposure and processing. Why Learn Senstometry? Provides all the characteristics of a film o Determine the exposure latitude of film o Determine what kind of film you have Normal-Contrast film Continuous-Tone Film Copy Film Line-Copy Film o Film Speed Help in determining the accuracy of your own camera What do we need to do Film Sensitometry? Film Step Tablet or Gray Scale Sensitometer (or camera) Densitometer Excel (or graphing paper) French Curve (if you are plotting by hand) Sensitometers Step Tablet Serves as the subject for the sensitometer Its purpose is to convert on single level of light into a graduated series of illuminances on the film Standard step tablet will range in density from 0.1 to 3.1 o 11 step tablet: steps of 0.3 increments (one stop change in exposure) o 21 step tablet: steps of 0.15 increments (half stop change in exposure) What is a sensitometer? An instrument that gives a photographic emulsion a graduated series of exposures to light of controlled spectral quality, intensity, and duration.exposures to light of controlled spectral quality, intensity, and duration....
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Week 1 Notes - Film Sensitometry 10/03/2008 07:02:00 What...

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