A flash controlling apparatus is provided including a light receiving unit
PS, a current-to-voltage converter IVC, a comparator CR, and a
micro-controller MC. The light receiving unit PS generates a current
signal corresponding to the flash intensity of a camera. The
current-to-voltage converter IVC converts the current signal received from
the light receiving unit PS into a voltage signal S.sub.PS. The comparator
CR compares the voltage signal S.sub.PS with a reference voltage V.sub.REF
to obtain a resultant logic signal S.sub.COM. The micro-controller MC
controls the operation of the current-to-voltage converter IVC and
controls the operation of a flash device of the camera according to the
resultant logic signal S.sub.COM received from the comparator CR. The
voltage signal S.sub.PS from the current-to-voltage converter IVC has the
characteristics of a logarithmic function with respect to time.
