Basic Photography Course

Courtesy of EG&G, Inc.

302.288X

these measurements are through sensitometry and
densitometry. When sensitometry and densitometry are
used, variations from the standard and the corrections
recommended are expressed in numbers, not in terms of
personal opinion.

SENSITOMETRY

Sensitometry is the science of determining the

photographic characteristics of light-sensitive
materials. In sensitometry, special test or control strips
are prepared by accurately exposing the material with
varying amounts of light. These test strips are then
processed.

A sensitometer is an instrument used to produce the

special test strips called sensitometric strips. A
sensitometer is used to produce these sensitometric
strips because it provides consistent and repeatable
exposures of a known quantity and quality of light. The
sensitometer is used to expose a strip of film with
varying amounts of known exposure on the same strip
of film. Since the sensitometer provides repeatable
exposures each time, any changes in density indicates a
change in processing. In Navy photography, the
sensitometer is used to expose black-and-white
materials only. There are several uses for sensitometric

strips; but in this training manual, we are only concerned
with monitoring a process. Here the sensitometric strips
are used as control strips. Control strips are made and
processed under the controlled conditions of time,
temperature, and agitation. This is true for both
black-and-white and color materials. Black-and-white
control strips are usually made in the photo lab, while
color control strips are obtained by the manufacturer of
each material.

Ideally, a sensitometer should be designed so you

can accomplish the following objectives:

1. Predetermine the total amount of exposure.

2. Determine the difference in exposures given to

various areas.

3. Control the color quality of the light.

4. Consistently reproduce or duplicate the same

lighting conditions.

5. Provide a wide range of exposures.

The sensitometer used most commonly in the Navy

today is the Egerton, Germeshausen, and Grier (EG&G)
sensitometer (fig. 10-24). This sensitometer uses a

10-39

contents

Basic Photography Course

<- previous page

next page ->


DOFMaster for Windows On-line Depth of Field Calculator DOFMaster for Mobile Devices On-line Depth of Field Table Hyperfocal Distance Chart Articles FAQ Recommended Books Support Contact Links Home As an Amazon Associate I earn from qualifying purchases.	contents <- previous page next page -> Figure 10-24.EG&G sensitometer. Courtesy of EG&G, Inc. 302.288X these measurements are through sensitometry and densitometry. When sensitometry and densitometry are used, variations from the standard and the corrections recommended are expressed in numbers, not in terms of personal opinion. SENSITOMETRY Sensitometry is the science of determining the photographic characteristics of light-sensitive materials. In sensitometry, special test or control strips are prepared by accurately exposing the material with varying amounts of light. These test strips are then processed. A sensitometer is an instrument used to produce the special test strips called sensitometric strips. A sensitometer is used to produce these sensitometric strips because it provides consistent and repeatable exposures of a known quantity and quality of light. The sensitometer is used to expose a strip of film with varying amounts of known exposure on the same strip of film. Since the sensitometer provides repeatable exposures each time, any changes in density indicates a change in processing. In Navy photography, the sensitometer is used to expose black-and-white materials only. There are several uses for sensitometric strips; but in this training manual, we are only concerned with monitoring a process. Here the sensitometric strips are used as control strips. Control strips are made and processed under the controlled conditions of time, temperature, and agitation. This is true for both black-and-white and color materials. Black-and-white control strips are usually made in the photo lab, while color control strips are obtained by the manufacturer of each material. Ideally, a sensitometer should be designed so you can accomplish the following objectives: 1. Predetermine the total amount of exposure. 2. Determine the difference in exposures given to various areas. 3. Control the color quality of the light. 4. Consistently reproduce or duplicate the same lighting conditions. 5. Provide a wide range of exposures. The sensitometer used most commonly in the Navy today is the Egerton, Germeshausen, and Grier (EG&G) sensitometer (fig. 10-24). This sensitometer uses a 10-39 contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
	WWW.DOFMASTER.COM © 2006 Don Fleming. All rights reserved.