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norwood

  1. Doug Kerr

    Norwood's dome in incident light exposure meters

    Many incident light exposure meters, both electromechanical and electronic, have a light collector in the form of a translucent hemispherical dome, or something similar. This construct has its roots in a development by Donald W. Norwood in the late 1930s. The story is a fascinating one, with...
  2. Doug Kerr

    "Norwood's dome" on incident light photographic exposure meters

    Most "traditional" hand-held photographic exposure meters for incident light metering have a "light collector" in the form of a hemisphere or thereabouts. The story behind this is very convoluted, but here is a synopsis. In cinematography, say as of the 1940s, incident light exposure metering...
  3. Doug Kerr

    Norwood's dome on incident light exposure meters

    For many years, almost all incident light exposure meters (or dual mode exposure meters in the incident-light mode) have had a translucent dome-like "receptor" over the light sensor proper. It is generally said that this is to make the meter respond "appropriately" to the various components of...
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