a camera has an ae sensor 10 and a display member 32 disposed in the vicinity of the focusing screen 4 , and a field frame switcher having a light interrupting wing capable of changing a field frame . the light - interrupting wing crosses and interrupts a predetermined luminous flux path used for obtaining information necessary for photographing while the field frame is changed . the light - interrupting wing is disposed close to the predetermined luminous flux path to reduce the space needed to house the structure .