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.