Electronic flash device of automatic light adjusting type

An electronic flash device of an automatic light adjusting type, including a main capacitor for storing charge at a high voltage, a flash discharge tube for generating flash light with a current upon discharging said main capacitor, and a light adjusting circuit for adjusting a light amount of said flash light, said flash device comprising:

• wherein said light adjusting circuit includes:
• a reflected light measuring unit for outputting an integration voltage for representing a light amount of reflected light from a photographic field illuminated with said flash light;
• a non-contact switch for short-circuiting terminals of said main capacitor upon being turned on, to quench emission of said flash light in said flash discharge tube;
• a turn-on capacitor for being charged in response to said emission of said flash light, and for being discharged when said integration voltage comes up to a prescribed level, to turn on said non-contact switch upon a pulse of discharge;
• and
• a control switching element for keeping said reflected light measuring unit disabled while said turn-on capacitor is initially charged, and for enabling said reflected light measuring unit after voltage across said turn-on capacitor comes up to a predetermined level.