Abstract: A camera view finder has a movable eyepiece lens barrel which is automatically shifted in the optical axis to a specific axial position in which the view finder protrudes from the camera body and provides dioptric power suitable for normal eyesight photographers when powering on the camera, to an additional axial position and to shifted back within the camera body when powering off camera.

Abstract: A camera viewfinder having a plurality of lens groups, wherein a photographing optical system of the camera is separate from the viewfinder. The viewfinder includes a parallax error compensating and diopter adjusting lens group which is one of the plurality of lens groups. The viewfinder further includes a guide member for guiding the compensating and adjusting lens group in a direction that intersects the optical axis of the viewfinder so as to move the lens group towards and away from the optical axis of the photographing optical system. In addition, there is provided an object distance detecting mechanism for detecting a distance of an object to be photographed, and a movement control mechanism for continuously moving the parallax error compensating and diopter adjusting lens group along the guide member in accordance with the object distance detected by the object distance detecting mechanism.

Abstract: A viewfinder device has an objective lens element (2) disposed on a viewfinder light path and an eyepiece lens element (3, 28) disposed behind the objective lens element. An image (10) of an object (7) is observable at an eye point (EP). At least one indicia portion (4, 12, 13, 20, 25, 35, 36, 40a, 40b) is disposed in front of the eyepiece lens element, for indicating information related to a taking field. At least one micro lens (5, 5a, 5b, 6a, 6b, 9a, 9b, 14, 17, 22, 30, 32a, 32b) has positive power, is disposed behind the indicia portion, renders an image of the indicia portion observable, and meets0.5.ltoreq.2e.multidot.tan .theta..ltoreq.2.5where e is a distance from the micro lens to the eye point, and .theta. is a half of an angle defined by a convex surface of the micro lens as viewed from the eye point.

Abstract: A viewfinder device includes a first prism unit and a second prism unit. The first prism unit includes an incident/reflecting surface 1-1 for receiving and allowing light from the objective lens to enter the first prism unit, a surface 1-2 for reflecting the light entering from the surface 1-1, and a surface 1-3 for reflecting the light reflected by the surface 1-2. The second prism unit includes an incident/reflecting surface 2-1 for receiving and allowing the light reflected by the surface 1-3 to enter the second prism, a surface 2-2 for reflecting the light entering the surface 2-1, and a surface 2-3 for reflecting the light reflected by the surface 2-2. The surface 2-1 reflects the light reflected by the surface 2-3, and the objective lens forms an image between the first prism unit and the second prism unit.

Abstract: This specification discloses an apparatus in which data regarding the proper lens positions of a diopter correcting lens when an observer is wearing spectacles and when the observer is not wearing spectacles are pre-stored in a memory circuit, the presence or absence of the spectacles is detected by a detecting circuit for detecting the state of an anterior eye part, the data in the memory circuit are extracted in conformity with this state, and the diopter correcting lens is moved on the basis of these data.