Letter | Published:

Chromatic Correction of Wide-Aperture Catadioptric Systems

Nature volume 160, pages 9192 (19 July 1947) | Download Citation

Subjects

Abstract

In the Schmidt camera system, where the spherical aberration of a mirror for a selected wave-length of light may be completely corrected by a suitably figured plate at the centre of curvature, there remains a chromatic variation of spherical aberration which sets a limit to the performance on the axis and for small angles of field, and which, for large relative apertures, becomes undesirably large. The effect is commonly reduced by introducing first-order axial chromatic aberration by using a corrector plate in the form of a figured lens of finite power instead of a figured plane parallel plate, the form in which the axial and marginal thicknesses are equal being not far removed from the optimum. Fig. 1 shows the departures (measured in d wave-lengths per 25 mm. of focal length) of the C and g emergent wave-fronts from the spherical d wave-front for a Schmidt system of relative aperture f/0·7, using for the corrector plate a borosilicate crown glass, nd = 1·516, V = 64·1, the maximum aberration for g being 1·5 wave-lengths when the marginal and intermediate zonal errors are equalized. The chromatic difference of spherical aberration is, of course, of the sign corresponding to an increase of glass-path with increasing aperture.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1.

    , J. Opt. Soc. Amer., 34, 270 (1944); Nature, 155, 798 (1945).

  2. 2.

    , Nature, 155, 583 (1946).

Download references

Author information

Affiliations

  1. Wray (Optical Works), Ltd., Ashgrove Road, Bromley, Kent.

    • C. G. WYNNE

Authors

  1. Search for C. G. WYNNE in:

About this article

Publication history

Published

DOI

https://doi.org/10.1038/160091b0

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.