Abstract

A study has been made of the variation in resolving power with magnification for telescopic systems used to view Foucault test objects of different inherent contrast. The study included the use of a form of the K.D.C. Apparatus. The results of the study indicate the existence of an optimum magnification that can be used to resolve Foucault test objects and that the optimum value of the magnification depends upon the inherent contrast of the test object. As the test object contrast decreases, the optimum amount of magnification decreases. For test objects having an inherent contrast of approximately 100 percent, an optimum amount of magnification was found to be approximately 70× for each 25.4 mm of aperture of the telescopic system under consideration. For objects of 10 percent inherent contrast, the optimum magnification was found to be approximately 30× for each 25.4 mm of aperture.

© 1949 Optical Society of America

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References

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  1. Howard S. Coleman and Samuel W. Harding, Methods for Making Precise Resolution Measurements, J. Opt. Soc. Am. 37, 263–271 (1947).
    [Crossref] [PubMed]

1947 (1)

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Figures (8)

F. 1
F. 1

Schematic diagram of the Kinetic Definition Chart Apparatus Model 2.

F. 2
F. 2

The Kinetic Definition Chart Apparatus Model 2.

F. 3
F. 3

The Foucault test objects used with the Kinetic Definition Chart Apparatus Model 2.

F. 4
F. 4

Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/11.5 lens inverting telescopic system having 6 air-glass surfaces and an aperture of 7.12 mm.

F. 5
F. 5

Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/11.5 lens inverting telescopic system having 12 air-glass surfaces and an aperture of 25.4 mm.

F. 6
F. 6

Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/5.0 lens erecting telescopic system having 34 air-glass surfaces and an aperture of 21.7 mm.

F. 7
F. 7

Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/4.0 lens erecting telescopic system having 28 air-glass surfaces and an aperture of 35.0 mm.

F. 8
F. 8

Optimum magnification per 25.4 mm of aperture for the resolution of Foucault test objects using telescopic systems.

Tables (4)

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Table I Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/17.1 lens inverting telescopic system having 6 air-glass surfaces and an aperture of 7.12 mm.

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Table II Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/11.5 lens inverting telescopic system having 12 air-glass surfaces and an aperture of 25.4 mm.

Tables Icon

Table III Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/5.0 lens erecting telescopic system having 34 air-glass surfaces and an aperture of 21.7 mm.

Tables Icon

Table IV Coefficient of specific resolution for Foucault test objects of different inherent contrast vs. magnification for an F/4.0 lens erecting telescopic system having 28 air-glass surfaces and an aperture of 35.0 mm.