A finder apparatus according to a first aspect of the present invention includes an optical finder for observing an optical image of a subject using an eyepiece portion, a display device that displays information, a half mirror that is arranged on an optical path of the optical finder, an electronically variable ND filter that is inserted on a subject side from the half mirror on the optical path of the optical finder, a brightness information acquisition unit that acquires brightness information of external light, a brightness measurement unit that measures brightness of the incident external light, and a transmittance calculation unit that calculates transmittance of the electronically variable ND filter in real time based on the measured brightness and the acquired brightness information.

A finder apparatus according to a first aspect of the present invention includes an optical finder for observing an optical image of a subject using an eyepiece portion, a display device that displays information, a half mirror that is arranged on an optical path of the optical finder, an electronically variable ND filter that is inserted on a subject side from the half mirror on the optical path of the optical finder and is divided into a plurality of regions, a brightness information acquisition unit that acquires brightness information of external light, a brightness measurement unit that measures brightness of incident light for each of the plurality of regions, and a transmittance calculation unit that calculates transmittance of the electronically variable ND filter for each of the plurality of regions based on the measured brightness and the acquired brightness information.

A finder apparatus according to a first aspect of the present invention includes an optical finder for observing an optical image of a subject using an eyepiece portion, a display device that displays information, a half mirror that is arranged on an optical path of the optical finder, an electronically variable ND filter that is inserted on a subject side from the half mirror on the optical path of the optical finder and is divided into a plurality of regions, a brightness information acquisition unit that acquires brightness information of external light, a brightness measurement unit that measures brightness of incident light for each of the plurality of regions, and a transmittance calculation unit that calculates transmittance of the electronically variable ND filter for each of the plurality of regions based on the measured brightness and the acquired brightness information.

An apparatus that comprises a camera opening that couples to a camera lens of a camera and a viewfinder collocated with the camera opening. The viewfinder comprises a mirror coupled to an aperture having a width and a height. The mirror is recessed into the apparatus at a depth defined by a height of the aperture. The width and the height of the aperture being based on a field of view of the camera. The viewfinder having a field of view that approximates the field of view of the camera for a range of viewing angles. Other embodiments are described herein.

An apparatus that comprises a camera opening that couples to a camera lens of a camera and a viewfinder collocated with the camera opening. The viewfinder comprises a mirror coupled to an aperture having a width and a height. The mirror is recessed into the apparatus at a depth defined by a height of the aperture. The width and the height of the aperture being based on a field of view of the camera. The viewfinder having a field of view that approximates the field of view of the camera for a range of viewing angles. Other embodiments are described herein.

An image pickup apparatus includes a lens barrel unit including an imaging optical system, a first cylindrical member, a second cylindrical member movable relative to the first cylindrical member along a guide bar between a retracted position and a pop-up position, a diopter adjuster provided on the second cylindrical member, a first detector configured to detect that the second cylindrical member is located at the retracted position or the pop-up position, and a first display unit. The guide bar is formed inside a projection surface of the first display unit when viewed from an optical axis direction. The first detection unit is fixed onto the first cylindrical member, and the first detector is more distant from the lens barrel unit than a reference line that passes a center of the first cylindrical member when viewed from the optical axis direction.

Systems and methods directed to a digital rangefinder camera are described. The digital rangefinder camera may include a viewfinder assembly configured to receive a first optical image from a first optical path and a focus ring movement detection assembly configured to detect an amount of movement associated with a focus ring of a lens attached to the digital rangefinder camera. A processing device may be configured to provide a movement signal indicative of the amount of movement associated with the focus ring to an actuator coupled to an optical element, where the actuator moves the optical element and displaces a second optical image from a second optical path directed toward an optical component in the viewfinder assembly. The optical component in the viewfinder assembly is configured to project the first optical image and the second optical image toward a single common viewing position when the first optical image and the second optical image coincide.

An optical device includes an objective module, a prism module and an ocular module. The prism module includes a first prism, a second prism and a first coating. The prism module is disposed between the objective module and the ocular module. A first light beam emitted by an object sequentially passes through the objective module, the prism module and the ocular module. Central axes of the objective module and the ocular module are in parallel without overlapping.

Provided are an imaging device, a finder device, a method of controlling an imaging device, a method of controlling a finder device, a control program for an imaging device, and a control program for a finder device capable of preventing burn-in of a display device that displays display information on an optical image of a subject observed through an optical finder in a superimposed manner, and preventing a relative positional relationship between a position of the display information displayed on the display device and a range, in which imaging is actually performed, from being changed. Display information, such as a visual-field frame, displayed at a prescribed position of an OLED display (218) is moved on the OLED display (218), and burn-in of the OLED display (218) is prevented. An imaging range of an image sensor (201) is moved corresponding to movement of the display information, and a relative positional relationship between a position of the display information displayed on the optical image of the subject observed through the optical finder in a superimposed manner and a range to be actually imaged is prevented from being changed.

An imaging element incorporates a memory and a processor. The memory stores image data obtained by imaging a subject at a first frame rate. The processor is configured to derive a degree of difference between first image data obtained as the image data by performing imaging and second image data that is obtained as the image data earlier than the first image data and stored in the storage portion, and perform processing of deciding at least one of the first image data or the second image data as the output image data in a case where the derived degree of difference is greater than or equal to a threshold value. The processor is configured to output the decided output image data at a second frame rate.