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Old July 21st, 2014, 01:35 PM
Doug Kerr Doug Kerr is offline
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Join Date: May 2006
Location: Alamogordo, New Mexico, USA
Posts: 8,624

This gem is from the "Q & A" section of a user manual for an early Norwood Director incident light exposure meter (ca. 1952):
Q. Why don't you point the Director at the subject like you do with other meters?

A. The Norwood Director is a true incident light exposure meter, measuring all the light falling on the subject. The Photosphere is a miniature model of the camera side of a three dimensional subject. It should receive the same light as the camera subject, therefore the Photosphere is pointed toward the camera from the subject position.
Of course, we know that outlook is a bit fanciful, but this is the essence of the Norwood concept.

Best regards,

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