Abstract

Description and the performance are given of a reflecting telescope and accessory optics used to feed a Lyot tunable filter, and then to obtain monochromatic images near the wavelength. The instrumentation has been designed for coronal photography to be taken inside and outside the line during a total eclipse.

© 1970 Optical Society of America

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References

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  1. W. Grotrian, Z. Astrophys. B8, 124 (1934).
  2. K. E. Kissell, E. T. Tyson, Astron. J. 69, 547 (1964).
    [CrossRef]
  3. Z. Kopal, Ed., Physics and Astronomy of the Moon (Academic, New York, 1962).
  4. C. W. Allen, Astrophysical Quantities (Athlone Press, London, 1963).

1964 (1)

K. E. Kissell, E. T. Tyson, Astron. J. 69, 547 (1964).
[CrossRef]

1934 (1)

W. Grotrian, Z. Astrophys. B8, 124 (1934).

Allen, C. W.

C. W. Allen, Astrophysical Quantities (Athlone Press, London, 1963).

Grotrian, W.

W. Grotrian, Z. Astrophys. B8, 124 (1934).

Kissell, K. E.

K. E. Kissell, E. T. Tyson, Astron. J. 69, 547 (1964).
[CrossRef]

Tyson, E. T.

K. E. Kissell, E. T. Tyson, Astron. J. 69, 547 (1964).
[CrossRef]

Astron. J. (1)

K. E. Kissell, E. T. Tyson, Astron. J. 69, 547 (1964).
[CrossRef]

Z. Astrophys. (1)

W. Grotrian, Z. Astrophys. B8, 124 (1934).

Other (2)

Z. Kopal, Ed., Physics and Astronomy of the Moon (Academic, New York, 1962).

C. W. Allen, Astrophysical Quantities (Athlone Press, London, 1963).

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Figures (8)

Fig. 1
Fig. 1

Schematic of the light collector.

Fig. 2
Fig. 2

The ocular of the light collector.

Fig. 3
Fig. 3

Relative positions of the field stops.

Fig. 4
Fig. 4

Projection of the diaphragms onto the ocular plane.

Fig. 5
Fig. 5

Schematic of the objective and of the field lens.

Fig. 6
Fig. 6

The profile of the band of the Zeiss filter (width at 50% = 0.25 Å, peak transmission 8.2%).

Fig. 7
Fig. 7

Schematic of new camera objective, scanner, and reimaging system to Robot camera.

Fig. 8
Fig. 8

Reduction factor produced by the vignetting. A—with Zeiss filter in position (observed); B—without filter (observed); and C—light collector only (computed).

Tables (1)

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Table I Residual Aberration of the Objective f = 50 mm for λ = 3934 Å

Equations (2)

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Exposures ( sec ) 15 30 60 120 240 Density D = 0.15 0.37 0.70 1.20 1.52
B crescent = 5200 × 10 - 10 B ,

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