Abstract
PROF. H. HARTRIDGE in his letter in NATURE of January 21, expresses the need for “A lens having a numerical aperture of 0.8 or 0.7, a focal length of 25–50 mm. and adequate definition on the film over an area of 3–5 mm.” It is perhaps not commonly noticed that a Mangin lens-mirror out of a motorcar headlight has just about this specification. I have used such a mirror to photograph a cathode ray oscillogram. The definition, though not what one would desire, was yet good enough to be useful.
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References
A. C. W. Aldis, Trans. Optical Soc., 21, 113; 1920.
W. B. Rayton, Sci. Abs., A 3987; 1930.
J. C. McLennan and H. J. C. Ireton, Proc. Roy. Soc., A, 129, 31; 1930.
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RICHARDSON, L. Photography of Faint Transient Light-Spots. Nature 131, 401–402 (1933). https://doi.org/10.1038/131401b0
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DOI: https://doi.org/10.1038/131401b0
