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Originally Posted by Stephen Fox
Hmmm, DOF finder or focus aid?
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They used to call them range finders and they were used to tell you the distance of the subject which you then set on the lens. They belonged to the days when most cameras did not have a built in range finder and no focusing screen. Looking through the hole two halves of the image were seen out of line. You turned the dial until the two halves lined up and then read the distance off the dial. Cost in those days about £3.50