Flash controlling apparatus utilizing characteristics of a logarithmic function

A flash controlling apparatus comprising:

• a light receiving unit which generates a current signal corresponding to a flash intensity of a light flash emitted by a flash device of a camera;
• a current-to-voltage converter coupled with the light receiving unit to receive the current signal and which is operative to convert the current signal into a voltage signal;
• a comparator coupled with the current-to-voltage converter and which is operative to compare the voltage signal with a reference voltage to obtain a resultant logic signal;
• and,
• a micro-controller coupled with the current-to-voltage converter and with the flash device of the camera and which controls the operation of the current-to-voltage converter and which is operative to control the operation of the flash device of the camera according to the resultant logic signal, wherein the voltage signal from the current-to-voltage converter has the characteristics of a logarithmic function with respect to time.