Abstract

A simple optical system consisting of two small lenses can be designed to take the place of a large flat in testing paraboloidal mirrors. Other aspheric concave mirrors can also be tested in this manner. The procedure for computing such a null corrector and the accuracy required in its manufacture and use are discussed.

© 1963 Optical Society of America

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References

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  1. H. E. Dall, “A null test for paraboloids.” Amateur Telescope Making (Book Three) (Scientific American, New York, 1953), pp. 149–153.
  2. F. E. Ross, Astrophys. J. 98, 341–346 (1943).
    [Crossref]

1943 (1)

F. E. Ross, Astrophys. J. 98, 341–346 (1943).
[Crossref]

Dall, H. E.

H. E. Dall, “A null test for paraboloids.” Amateur Telescope Making (Book Three) (Scientific American, New York, 1953), pp. 149–153.

Ross, F. E.

F. E. Ross, Astrophys. J. 98, 341–346 (1943).
[Crossref]

Astrophys. J. (1)

F. E. Ross, Astrophys. J. 98, 341–346 (1943).
[Crossref]

Other (1)

H. E. Dall, “A null test for paraboloids.” Amateur Telescope Making (Book Three) (Scientific American, New York, 1953), pp. 149–153.

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Figures (6)

Fig. 1
Fig. 1

Optical system for obtaining spherical aberration following a desired law.

Fig. 2
Fig. 2

“Aberration” of normals to a parabola.

Fig. 3
Fig. 3

Optical system used for null testing a 91-cm f/4 parabolic mirror at center of curvature.

Fig. 4
Fig. 4

Focogram of 91-cm mirror made by autocollimation off 100-cm flat.

Fig. 5
Fig. 5

Focogram of 91-cm mirror made with null corrector shown in Fig. 3.

Fig. 6
Fig. 6

“Aberration” of normals to a hyperbola.

Equations (1)

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CD = ( - R / 2 ) tan 2 U .

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