Optical apparatus including a light modulation finder optical system

An optical apparatus comprising:

• a projection optical system for projecting an image of an object;
• a finder system for observing the object with a light emitted from said projection optical system, said finder system being provided with light modulation means for creating one of a light transmission state and a cutoff state in accordance with the presence or absence of input of electric energy, and said light modulation means being disposed so as to cover the entire view field of said finder system;
• means for deciding whether an eye of a user of said optical apparatus contacts said finder system;
• a switch for starting said optical apparatus making a photometric operation;
• and
• control means for bringing an entirety of a surface of said light modulation means into the transmission state when the eye of the user contacts said finder system and the switch is turned on, and then bringing a portion of said light modulation means into the cutoff state when the eye of the user remains in contact with said finder system and said switch is on.

An optical apparatus comprising:

• a projection optical system for projecting an image of an object;
• a finder system for observing the object with a light emitted from said projection optical system, said finder system being provided with light modulation means for creating one of a light transmission state and a cutoff state in accordance with the presence or absence of input of electric energy, and said light modulation means being disposed so as to cover the entire view field of said finder system;
• and
• control means for controlling input of the electric energy to said finder system so as to input first electric energy to said light modulation means when a command signal is supplied thereto, and input second electric energy with intensity lower than said first electric energy to said light modulation means when the command signal is not supplied thereto, the command signal being a signal indicating that the eye of a user is in contact with said finder system and a photographic preparation operation is being started.

An optical apparatus comprising:

• a projection optical system for projecting an image of an object;
• a finder system for observing the object with a light emitted from said projection optical system, said finder system being provided with light modulation means for creating one of a light transmission state and a cutoff state in accordance with the presence or absence of input of electric energy, and said light modulation means being disposed so as to cover the entire view field of said finder system;
• and
• control means for controlling input of the electric energy to said finder system so as to input first electric energy to said light modulation means when a command signal is supplied thereto, and input second electric energy with a frequency lower than the first electric energy to said light modulation means when the command signal is not supplied thereto, the command signal being a signal indicating that the eye of a user is in contact with said finder system and a photographic preparation operation is being started.