QC 351 A7 no. 28 / A simple functional relationship was found between normalized
photographic resolving power (RN) and target modulation (M) given by
RN = Mn, where RN is the ratio of the resolving power at a modulation
(M) to the resolving power for M > 0.98 and n is an arbitrary constant.
Since this equation provides a useful approximation to most of the measured curves, the resolving power dependence on target modulation for a
given lens -film combination can be specified by the high contrast AWAR
and the constant n. The value of n was found to lie between 0.46 and
0.62 for the AWAR versus target modulation curves of the 10 lens -film
combinations analyzed. The effects of such factors as development, filter, and exposure on this relationship were found to be generally weak
and seldom simply predictable.
In tests to determine typical values of resolving power reading
differences, an 8% average difference in photographic resolving power was
encountered over 240 readings by three observers on Plus -X Aerecon film.
A comparison of photographic resolving power versus target modulation
curves obtained from experiments using seven test targets with those
obtained from experiments using fewer targets showed that four targets,
with modulations of approximately 0.11, 0.29, 0.73, and 0.98 +, were sufficient to determine the resolving power dependence for M > 0.05.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/621622 |
| Date | 09 August 1968 |
| Creators | Mayo, James William III |
| Publisher | Optical Sciences Center, University of Arizona (Tucson, Arizona) |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | Technical Report |
| Rights | Copyright © Arizona Board of Regents |
| Relation | Optical Sciences Technical Report 28 |
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