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KF5JRV > TECH 11.08.16 15:45l 19 Lines 913 Bytes #999 (0) @ WW
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Subj: Cloud Cameras
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KF5JRV
Sent: 160811/1123Z 45@KF5JRV.#NWAR.AR.USA.NA BPQ1.4.65
Cloud cameras
Photography also developed into another technology used for studying clouds
and became an essential tool for training young meteorologists during the
twentieth century.
By 1924, Robert Hill (1899-1991) had developed a fish-eye lens that produced a
horizon-to-horizon image of the sky. The resulting photograph is
distorted according to orthographic and equidistant projection so that the
fish-eye image appears to bulge out at the viewer; however, it is possible to
produce a 'normal' viewing vantage using the negative of Hill's fish-eye image.
If the camera apparatus is set up like a magic lantern, in which light travels
through the negative and fish-eye lens to be projected onto a flat surface, a
portion of the image appears in 'normal' perspective. In this way, photographs
of many different views of the same cloud conditions can be printed from a
single fish-eye negative.
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