Arrangement for measuring exposure in photography with an electr

Details Arrangement for measuring exposure in photography with an electr Arrangement for measuring exposure in photography with an electr

1978-08-10

1981-02-24

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

356224, G01J 142, G01J 144

Patent

active

042524415

ABSTRACT:
An arrangement for measuring exposure in which an adapter is attached to an electronic exposure meter. The adapter has at least three plugs mating with corresponding sockets on the exposure meter. The exposure meter has a circuit supplying a measured voltage which is a linear function of the logarithm of a measured magnitude. A defined constant voltage is taken from the exposure meter circuit and applied to two sockets. The adapter has a voltage divider whose external connections are formed by two plugs which apply a constant voltage upon plugging the adapter to the exposure meter through the sockets. The voltage divider has a tap which is connected to another plug that is, in turn, connected, through the associated socket in the exposure meter, to a point in the circuit where application of a correction voltage results in a change in measured voltage equivalent to an increase in the measured magnitude. The resistances of the voltage divider are fixed so that the correction voltage taken from the voltage divider fully compensates the measured voltage change resulting from light losses of the adapter. The voltage divider has a fixed resistor and a balancing trimmer to enable an adapter to be individually balanced or trimmed.

REFERENCES:
patent: 3286097 (1966-11-01), Norwood
patent: 3697179 (1972-10-01), Pfaffenberger et al.

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