Flash photographing system

A flash photographing system having an automatic bracket mode in which quantity of flash light to be emitted from a flash unit is, in each flash photographing operation, shifted by a predetermined quantity so that plural times of flash photographing operations are performed, said flash photographing system comprising:

• (a) a first detection circuit which detects light reflected from an object in a scene in which flash light is emitted from said flash unit so as to discriminate whether or not the quantity of reflected light has reached a predetermined value;
• (b) a second detection circuit which directly monitors the quantity of light emitted from a light emitting portion of said flash unit to detect quantities of emitted light until said first detection circuit discriminates that the quantity of reflected light has reached a predetermined value;
• (c) a setting circuit for setting data about quantity of light as data for use in performing each flash photographing operation, data about the quantity of light being, by a predetermined quantity, shifted from reference quantity of light corresponding to the quantity of light detected by said second detection circuit;
• and
• (d) a control circuit for, in accordance with data set by said setting circuit, controlling quantity of light to be emitted from said flash unit when the flash photographing operation is performed.

A flash photographing system for performing flash photographing operations while shifting a quantity of light to be emitted in each photographing operation, said flash photographing system comprising:

• (a) a detection circuit for detecting a reference quantity of emitted light by emitting flash light;
• (b) a storage circuit for storing the reference quantity of emitted light detected by said detection circuit;
• (c) a light-emission-quantity determining circuit for determining one or more shifted quantities of light to be emitted during respective flash photographing operations, in accordance with the reference quantity of emitted light stored in said storage circuit;
• and
• (d) a light-quantity control circuit for directly detecting and controlling the quantity of light emitted during respective flash photographing operations.

A flash photographing system for performing a flash photographing operation while shifting the quantity of flash light to be emitted in each photographing operation, said flash photographing system comprising:

• (a) a detection circuit for detecting a reference quantity of emitted light by emitting flash light;
• (b) a storage circuit for storing the reference quantity of emitted light detected by said detection circuit;
• and
• (c) a light-emission-quantity determining circuit for determining a quantity of light in each flash photographing operation in accordance with the reference quantity of emitted light stored in said storage circuit,
• wherein said light-emission-quantity determining circuit has a setting circuit for setting data about quantities of light corresponding to guide numbers respectively shifted by predetermined steps from guide numbers corresponding to the reference quantity of emitted light stored in said storage circuit, said data about the quantity of light being set as quantities of light to be used in respective flash photographing operations.

A flash photographing system for performing flash photographing operations while shifting a quantity of light to be emitted in each photographing operation, said flash photographing system comprising:

• (a) a detection circuit for detecting a reference quantity of emitted light by emitting flash light;
• (b) a light-emission-quantity determining circuit for determining one or more shifted quantities of light to be emitted during respective flash photographing operations, in accordance with the reference quantity of emitted light;
• and
• (c) a light-quantity control circuit for controlling the quantity of light emitted on the basis of said shifted quantities during respective flash photographing operations.