Abstract: This application relates to capturing an image of a target object using information from a time-of-flight sensor. In one aspect, a method may include a time-of-flight (TOF) system configured to emit light and sense a reflection of the emitted light and may determine a return energy based on the reflection of the emitted light. The method may measure a time between when the light is emitted and when the reflection is sensed and may determine a distance between the target object and the TOF system based on that time. The method may also identify a reflectance of the target object based on the return energy and may determine an exposure level based on a distance between the target object and a reflectance of the target object.

Abstract: In an imaging apparatus having framing assist control, a controller controls a change speed of the display angle of view changed by a second or a third instruction member faster than the change speed of the display angle of view changed by a first instruction member. The first instruction member is configured to issue an instruction regarding a change of a display angle of view and a change direction of the display angle of view. The second instruction member is configured to issue an instruction to change the display angle of view displayed on the monitor to a wide-angle side by a predetermined amount. The third instruction member is configured to issue an instruction to change the display angle of view displayed on the monitor to the display angle of view before the display angle of view is changed by the second instruction member.

Abstract: An aspect of the present invention provides an interchangeable lens camera having a camera body and a lens unit that is freely attachable and detachable to the camera body. In the interchangeable lens camera, a communications unit in the camera body sends via communications terminals (MT_MOSI and MT_MISO) an INTR_BUSY control instruction that instructs whether to make notification with a busy signal (INTR_BUSY signal) for any operation out of a plurality of types of operations that can be executed, and the lens unit or camera body communications unit sets the busy signal (INTR_BUSY) to an ON state (low level) only during the period of operation of the type indicated by the INTR_BUSY control instruction.

Abstract: An image capture apparatus includes a variable translucency mirror, a viewfinder unit configured to receive light reflected by the variable translucency mirror, an imaging sensor configured to receive light transmitted through the variable translucency mirror, an image display unit configured to display an image based on the light received by the imaging sensor, and a controller configured to set a translucency of the variable translucency mirror. In a viewfinder mode, the controller sets the variable translucency mirror to be at least partially reflective such that light incident on the variable translucency mirror is reflected thereby and received by the viewfinder unit. In a display view mode, the controller sets the variable translucency mirror to be at least partially transparent, such that light incident on the variable translucency mirror is transmitted therethrough and received by the imaging sensor.

Abstract: A shape memory alloy actuation apparatus comprises a movable element supported on a support structure by a suspension system comprising a plurality of resilient flexures. A shape memory alloy actuator drives movement of the movable element on contraction. An end-stop limits the movement of the movable element in the opposite direction. Rather than using the resilient flexures of the suspension system as the sole biassing means, an additional Massing element biasses the movable element against the SMA actuator. When the moveable element is held against the end-stop, the force applied by the biassing element is greater than the force applied by the flexures of the suspension system. This reduces the design constraints, for example allowing a greater range of movement.

Abstract: A camera including a drive source, where the drive source is driven so that a charge member enters a moving locus of a mirror drive member when driving a mirror from a mirror down position to a mirror up position. After the charge member has entered the moving locus of the mirror drive member, the mirror drive member is moved from the mirror down position to the mirror up position by an urging force of the mirror drive spring.

Abstract: A single-reflex camera includes a mirror box, and a focus detecting unit. The mirror box further includes a first opening on a side of the image-pickup optical system, which the light flux that has passed the image-pickup optical system enters, and a bottom plate arranged between the mirror and the focus detecting unit, the bottom plate including a plate-shaped front part that extends so as to approach to an optical axis of the image-pickup optical system from the first opening. Part of the condenser lens is located on a side of the optical axis of the image-pickup optical system with respect to a line that is made by extending, parallel to the optical axis of the image-pickup optical system, an end of the first opening on a side of the bottom plate.

Abstract: A digital camera of the present invention includes a microcomputer 110 having a live view mode controlling so that image data generated by a CMOS sensor 130 or image data obtained by subjecting the image data generated by the CMOS sensor 130 to predetermined processing is displayed on a liquid crystal monitor 150 as a moving image in real time, wherein when a release button 141 receives an instruction regarding start of an autofocus operation in a live view mode, the microcomputer 110 controls a movable mirror to enter an optical path to measure by an AF sensor 132, and thereafter, allow the movable mirror to retract from the optical path to return the digital camera to the live view mode. Due to this configuration, in a digital camera that includes a movable mirror and is capable of displaying a subject image in a live view through an electronic viewfinder, the operability thereof can be enhanced.

Abstract: A digital single lens reflex (DSLR) camera is provided for displaying predetermined photographing information, including focus information, camera information, etc., on a display screen of a viewfinder. The DSLR camera includes: the viewfinder for observing an image of an object; a pentaprism outputting the image of the object to the viewfinder; and a display device disposed on a side of the pentaprism to display photographing information.

Abstract: An image capturing apparatus includes a shutter spring which urges a shutter drive member for driving shutter blades, a shutter charge unit which is used to charge the shutter spring, and is switched between a fixed state in which a charge operation of the shutter spring is complete, and the shutter drive member is fixed and a released state, and a drive unit which drives the shutter charge unit. When a second determination unit determines that a switching ready state of a mirror from a mirror-down state to a mirror-up state is set when a first determination unit determines that a charge operation of the shutter spring is complete, the drive unit is controlled to drive the shutter charge unit to the released state without latch the shutter charge unit in the fixed state after the charge operation of the shutter spring is complete.

Abstract: An interchangeable lens (second interchangeable lens) is disclosed which allows a protruding amount from a mount reference surface of the interchangeable lens to be increased. The second interchangeable lens has a protruding portion protruding from a mount reference surface toward an image plane, has a larger protruding amount than the first interchangeable lens and has the same flange back as the first interchangeable lens. The first camera prevents mounting of the second interchangeable lens by the protruding portion of the second interchangeable lens contacting the first wall portion. The second camera includes a second wall portion provided at a position retreated from the protruding portion. The second camera includes a rotatable mirror member, and the rotation center of the mirror member is positioned on the opposite side of a finder optical system with respect to a plane including an in-plane direction of the mirror member.

Abstract: A single-reflex camera includes a mirror box, and a focus detecting unit. The mirror box further includes a first opening on a side of the image-pickup optical system, which the light flux that has passed the image-pickup optical system enters, and a bottom plate arranged between the mirror and the focus detecting unit, the bottom plate including a plate-shaped front part that extends so as to approach to an optical axis of the image-pickup optical system from the first opening. Part of the condenser lens is located on a side of the optical axis of the image-pickup optical system with respect to a line that is made by extending, parallel to the optical axis of the image-pickup optical system, an end of the first opening on a side of the bottom plate.

Abstract: An imaging device includes an imaging unit; a display unit; an electronic finder unit that performs preview display before actual shooting based on image signals successively generated by the imaging unit; an optical finder unit having a finder window; an optical-path switching unit that performs switching between a first optical path through which light from a subject is guided to the finder window and a second optical path through which the light is guided to the imaging unit; an eye detecting unit that detects presence of an eye in a proximity of the finder window; a first control unit that performs a first control operation so that the optical-path switching unit selects the first optical path upon detection of an eye; and a second control unit that performs a second control operation so that the optical-path switching unit selects the second optical path upon non-detection of an eye.

Abstract: An image sensing apparatus comprises: a mirror which reflects light coming from a photographing optical system at a mirror down position; a mirror support member which rotatably supports the mirror; a contacting member against which the mirror support member contacts at the mirror down position; a rotatable first lever member; and a second lever member to which the contacting member is secured, and which is rotatably held by the first lever member, wherein when the mirror moves to the mirror down position, the mirror support member contacts against the contacting member, the second lever member then rotates relative to the first lever member and contacts against the first lever member, and by rotating the first lever member, the first and second lever members rotate without changing a relative positional relationship, so as to adjust a position of the contacting member with respect to the mirror support member.

Abstract: An imaging apparatus includes: a mount fixing member to which a lens mount is fixed; a connected body obtained by integrally connecting a plurality of constituent units including a battery holder unit, the plurality of constituent units provided around the mount fixing member; and a front member fixed to the connected body and integrated therewith, wherein the mount fixing member is fixed to the front member.

Abstract: An image pickup apparatus of the present invention includes a mechanical lock mechanism capable of holding a first curtain and a second curtain in an open state mechanically and a controller that controls the mechanical lock mechanism so as to hold the second curtain in the open state and controls a display so as to display image data generated based on a subject image incident upon an image pickup element as a moving image while the first curtain is in the open state.

Abstract: The mirror device of a single-lens reflex camera according to the present invention includes a main mirror section having a reflecting mirror surface that moves to a first position for reflecting an object beam to an observation optical system and to a second position retracted from the object beam, a sub-mirror section having a reflecting mirror surface located, in conjunction with movement of the main mirror section, at a position apart from the main mirror section when the main mirror section is located at the first position and at a position retracted from the object beam together with the main mirror section when the main mirror section is located at the second position, and a cushioning section interposed between the sub-mirror section and the main mirror section when the main mirror section moves from the first position to the second position.

Abstract: A lens changeable digital camera has an imaging section, including an image sensor for capturing a subject image via the photographing lens, a display section capable of displaying image information and/or character information, a shielding section capable of being moved into and out of an imaging light path of the image sensor, a detection section for detecting an operation to remove the photographing lens, and a control section for, after the shielding section has been moved out of the imaging light path, causing execution of an exposure operation for a specified period in the imaging section, and causing display of a moving image on the display section based on image data acquired by the exposure operation.

Abstract: A single-lens reflex camera has a first image pickup device as a main image pickup device, a second image pickup device for live-view observation, a reflection mirror which switches an optical path between an optical path directed toward the first image pickup device and an optical path directed toward the second image pickup device, and a control section. When the shooting operation is instructed with the second image pickup device driven and a live-view displayed, the control section starts driving the reflection mirror to retract the reflection mirror from the optical path, and stops the second image pickup device and starts driving the first image pickup device while the reflection mirror is driven in a retracting direction.

Abstract: A mirror adjustment mechanism including a first reflection mirror rotatable around a rotation shaft, and a second reflection mirror rotatably provided on the first reflection mirror. One of the ends of the rotation shaft of the first mirror is allowed to move in the direction of the surface of the first mirror. By this movement, it is possible to adjust the direction of the reflecting light on the second mirror without substantially affecting the direction of the reflecting light on the first mirror. For example, the present invention can be applied to the adjustment of a sub-mirror rotatably mounted on a main mirror of a single-lens reflex camera.

Abstract: A silicon-like resilient member is utilized for at least one of a mirror cushion and a light seal. This new member is believed to resist flaking and other problems associated with traditional foam members.

Abstract: The observation device includes: an optical unit on which an intermediate image of an object to be observed is formed; a display unit that displays an image of a subject to be photographed; and a display unit moving unit that causes the display unit to be inserted in and removed from an optical light path for observing the object without moving the optical unit. Also, the camera includes: a finder optical system and an image-capturing unit that captures an image of a subject. The finder optical system includes an eyepiece unit; a focal plane plate on which an intermediate image of an image of a photographic subject is formed; a display unit that emits light; and a display unit moving unit that causes the display unit to be inserted in and removed from a light path in a position closer to the eyepiece unit than the focal plane plate.

Abstract: There is disclosed a single-lens reflex camera which does not drive a movable reflecting mirror when it enters a shooting operation while a live view is being displayed. For example, the rotation direction of a motor controlling the driving of shutter charge and a movable reflecting mirror can differ between a live view state and the other states. Then, a transmission mechanism for transmitting a driving force from the motor to the movable mirror is configured to release its engagement between the motor and the movable mirror when the motor rotates in a direction for the live view state.

Abstract: The single-lens reflex digital camera includes a CCD for imaging an image for storage and a CCD for imaging an image for live view. A pixel signal output from the CCD is processed in an image preprocessing unit, an image general processing unit, and a JPEG processing unit and stored in a memory card as JPEG data. A pixel signal output from the CCD is processed in a live image processing unit and stored in the memory card as YUV data for display. A display control unit reads the YUV data for display from the main memory and outputs the data to a LCD. The CPU adjusts frame rate of the live view image depending on the usage rate of the band of a main bus.

Abstract: A digital single lens reflex (DSLR) camera is provided for displaying predetermined photographing information, including focus information, camera information, etc., on a display screen of a viewfinder. The DSLR camera includes: the viewfinder for observing an image of an object; a pentaprism outputting the image of the object to the viewfinder; and a display device disposed on a side of the pentaprism to display photographing information.

Abstract: An imaging device includes an imaging unit; a display unit; an electronic finder unit that performs preview display before actual shooting based on image signals successively generated by the imaging unit; an optical finder unit having a finder window; an optical-path switching unit that performs switching between a first optical path through which light from a subject is guided to the finder window and a second optical path through which the light is guided to the imaging unit; an eye detecting unit that detects presence of an eye in a proximity of the finder window; a first control unit that performs a first control operation so that the optical-path switching unit selects the first optical path upon detection of an eye; and a second control unit that performs a second control operation so that the optical-path switching unit selects the second optical path upon non-detection of an eye.

Abstract: A single-lens-reflex digital camera in which an optical image of an object that is to be photographed via a photographing lens is reflected by a main mirror to be formed on a focusing screen so that the optical image is viewed through a viewfinder while the main mirror is retracted from an optical path of the photographing lens to capture an image of the object by an image pickup device, the single-lens-reflex digital camera includes an electroluminescent display provided on the focusing screen, wherein the electroluminescent display displays at least the object image captured by the image pickup device. The single-lens-reflex digital camera is configured to allow the object image displayed by the electroluminescent display and the optical image formed on the focusing screen to be viewed through the viewfinder.

Abstract: An imaging apparatus is disclosed. The apparatus includes: (a) an imaging device subunit having an imaging device for creating an image signal associated with a subject and a light-transmitting member mounted ahead of a photosensitive surface of the imaging device; (b) a first driver circuit for driving a first actuator that moves the imaging device subunit in a first direction; (c) a second driver circuit for driving a second actuator that moves the imaging device subunit in a second direction substantially perpendicular to the first direction; and (d) first dust-removing means for shaking off dust adhering to the light-transmitting member by driving a given actuator so as to vibrate the light-transmitting member; wherein the given actuator is driven using the first driver circuit or the second driver circuit.

Abstract: In a single-lens reflex camera, the rotation center of a lever used for driving a shutter device is arranged rearward of a shutter device with respect to an optical axis, and the lever end (point of action) is arranged in front of the shutter device with respect to the optical axis. Thereby, compactness of the camera body can be realized.

Abstract: An image sensing apparatus is provided with an aperture unit (104), an image sensor (106) that converts light beams entering through a photographing lens (103) and the aperture unit into electrical signals, and a display unit (107), including an electronic viewfinder mode to continuously display on the display unit images based on the electrical signals obtained by the image sensor. The image sensing apparatus has a control unit (135) that causes the aperture unit to stop down, when there is an instruction to display on the display unit an image other than the image based on the electrical signals obtained by the image sensor while in the electronic viewfinder mode.

Abstract: The observation device includes: an optical unit on which an intermediate image of an object to be observed is formed; a display unit that displays an image of a subject to be photographed; and a display unit moving unit that causes the display unit to be inserted in and removed from an optical light path for observing the object without moving the optical unit. Also, the camera includes: a finder optical system and an image-capturing unit that captures an image of a subject. The finder optical system includes an eyepiece unit; a focal plane plate on which an intermediate image of an image of a photographic subject is formed; a display unit that emits light; and a display unit moving unit that causes the display unit to be inserted in and removed from a light path in a position closer to the eyepiece unit than the focal plane plate.

Abstract: There is provided an imaging apparatus having a viewfinder optical system; a first image sensor; a photometric sensor; and optical path changing means. The viewfinder optical system has a first reflective surface that reflects a monitoring luminous flux, and the first reflective surface changes a reflection angle of the monitoring luminous flux. A change in a reflection angle of the first reflective surface causes a course of the monitoring luminous flux to be switched between a first optical path and a second optical path. In a case of second optical path, a travel direction is changed with the optical path changing means placed on the second optical path, causing a photometric processing to be performed using the first image sensor, while in a case of the first optical path, the photometric processing is performed using the photometric sensor.

Abstract: In a lens-interchangeable digital camera having a half mirror arranged in a shooting optical path and capable of displaying a live view, the half mirror is made movable between a position inserted into the shooting optical path and a position retracted from the shooting optical path, and when power-on is detected, the movable half mirror is returned to the position in the shooting optical path, while when power-off is detected, the movable half mirror is retracted from the shooting optical path. Further, upon detecting the mounting state of a lens barrel, when removal of the lens barrel is detected, the movable half mirror is retracted, while when mounting of the lens barrel is detected, the movable half mirror is returned.

Abstract: A single-lens reflex camera has a first image pickup device as a main image pickup device, a second image pickup device for live-view observation, a reflection mirror which switches an optical path between an optical path directed toward the first image pickup device and an optical path directed toward the second image pickup device, and a control section. When the shooting operation is instructed with the second image pickup device driven and a live-view displayed, the control section starts driving the reflection mirror to retract the reflection mirror from the optical path, and stops the second image pickup device and starts driving the first image pickup device while the reflection mirror is driven in a retracting direction.

Abstract: A camera which includes a camera body includes a main body and a mirror box fixed to the main body. The mirror box and the main body are made of a first material having a first thermal expansion coefficient and a second material having a second thermal expansion coefficient, respectively, the second thermal expansion coefficient being smaller than the first thermal expansion coefficient. The mirror box is fixed to the main body by at least two fixing devices symmetrically disposed with respect to an optical axis.

Abstract: A rotatable semitransparent mirror is arranged at an inclination above the optical path from the taking lens to the image sensing element, and the light reflected by the semitransparent mirror is directed to an optical finder provided above the mirror. The image sensed by the image sensing element is displayed on a liquid crystal display. The variation in the optical path from the taking lens to the image sensing element depending on whether or not the semitransparent mirror is set on the optical path is corrected by changing the position of the image sensing element or the taking lens, such that the impingement state of the light on the image sensing element or the optical path length from the taking lens to the image sensing element is normally rendered fixed.

Abstract: A camera includes a screen on which an image of an object is projected, a plurality of reflection surfaces for erecting the image on the screen, and an eyepiece system with positive refracting power for observing the image. In this case, the eyepiece system includes, in order from the object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power. Spacings between the first lens component and the second lens component and between the second lens component and the third lens component are changed to thereby make a diopter adjustment, and the camera satisfies the following conditions: 0.15<tan(S)<0.35 2.00<fb/Y<4.00 ?0.80<f3/f<?0.

Abstract: A light-projecting device comprises an ocular optical system facing an emergent opening of a hollow pentagonal mirror. A superimpose-plate is provided in an incident opening of the hollow pentagonal mirror so that a subject image obtained through a photographing optical system is formed. The superimpose-plate is put on a focusing glass. A mark, indicated in a picture plane of the view finder, is formed on the superimpose-plate. A light source radiates an illumination light beam. A light-projecting prism reflects the illumination light beam toward the emergent opening. The light-projecting prism has a light-projecting plane. The light-projecting plane is located below the optical axis of the ocular optical system.

Abstract: A digital camera having a taking lens, a finder for viewing light transmitted through the taking lens, an image sensing element for optoelectrically converting light which passes through the taking lens, a light splitter capable of changing transmittance and dividing the light transmitted through the taking lens to the image sensing element and the finder, a light splitter driver for driving the light splitter to a position to split the light between the image sensing element and the viewfinder when viewing and driving the light splitter to retract a position for directing the light only to the image sensing element during photography, and a controller for controlling the light splitter to a semi-transparent state to direct light to the image sensing element and the viewfinder when viewing and controlling the light splitter to a blocking state during photography.

Abstract: A fixing device for fixing an autofocus module to a mirror box of an SLR camera having a quick-return mirror accommodated in the mirror box, wherein the quick-return mirror has a half mirror portion so that a light bundle of an object which is passed through the half mirror portion is reflected by a sub-mirror to be incident on the autofocus module. The fixing device includes an adjustment bracket which is provided separately from the mirror box, the adjustment bracket is fixed to an underside of the mirror box, and the auto focus module is fixed to the adjustment bracket.

Abstract: A digital single lens reflex camera includes a reflector located in a photographic light path to reflect object-carrying light transmitted through a photographic optical system toward a finder optical system. An image pickup device is located at the imaging plane of the photographic optical system. The object-carrying light in the photographic light path is reflected by the reflector in a direction substantially away from an eyepiece optical system of the finder optical system. A reflection light path is formed in the vicinity of the photographic optical system and is provided with a plurality of reflection surfaces to make the light reflected by the reflector in the photographic light path incident on the eyepiece optical system. Furthermore, a relay optical system is located in the reflection light path to relay an image formed on a primary imaging plane, which is optically equivalent to an image pickup surface of the image pickup device, to the eyepiece optical system.

Abstract: A shutterless digital camera includes an optical viewfinder having a pair of spaced apart mirrors for facilitating in one mode of operation through-the-lens viewing of an object image to be captured and for facilitating in the same one mode of operation through-the-lens display unit viewing of a captured object image. A mirror control system facilitates the moving of at least one of the mirrors to permit the object image to be captured and further facilitates the moving of at least the other one of the mirrors to permit display unit viewing of the captured object image.

Abstract: A fixing device for fixing an autofocus module to a mirror box of an SLR camera having a quick-return mirror accommodated in the mirror box, wherein the quick-return mirror has a half mirror portion so that a light bundle of an object which is passed through the half mirror portion is reflected by a sub-mirror to be incident on the autofocus module. The fixing device includes an adjustment bracket which is provided separately from the mirror box, the adjustment bracket is fixed to an underside of the mirror box, and the auto focus module is fixed to the adjustment bracket.

Abstract: A single-lens reflex camera provided with an eyepiece includes a screen on which an image of an object is projected, a plurality of reflecting surfaces for erecting the image projected on the screen, and an eyepiece with positive refracting power for observing the image. In this case, the eyepiece has, in order from the object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions: 0.15<tan S<0.35 2.00<fb/Y<5.00 −0.67<f3/f<−0.

Abstract: A camera includes a screen on which an image of an object is projected, a plurality of reflection surfaces for erecting the image on the screen, and an eyepiece system with positive refracting power for observing the image. In this case, the eyepiece system includes, in order from the object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power.

Abstract: Openings 30 are formed in positions that are exposed when the back cover of the camera is opened so that ratchets 14a and 14b of a shutter unit 10 incorporated in a camera body 1 are seen through the openings 30. After external parts such as a cover are attached and the camera is assembled to a substantially finished state, the back cover is opened. Then, inserting a tool through the opening 30, the ratchet 14a or 14b is rotated to perform the final adjustment of the screen speed of the shutter unit 10. After the final adjustment, a perforation detection unit 32 is attached to cover the openings 30.

Abstract: A single-lens-reflex camera includes means for virtually eliminating vibration, noise, and motion caused by mirror movement, resulting in a higher resolution image being recorded on a light-sensitive surface at the rear of the camera. A pair of bi-parting mirrors are smoothly and noiselessly slid from a position adjacent each other, reflecting an image upward to a viewing screen for focusing and viewing, to a separated position. When mirrors are separated they are clear of the image, so the image can then fall upon the shutter and light-sensitive surface at the rear of the camera. After the image is recorded on the light-sensitive surface, the mirrors return to their original adjacent position. The mirrors are symmetrically arranged, so their inertial masses oppose and cancel each other during mirror movement, thereby eliminating camera movement from this source. This allows larger and heavier mirrors to be used in large format cameras.

Abstract: At minimum, a member near an image plane that is observed through an eyepiece is made of antistatic resin obtained by giving the resin itself ion conductivity so that its antistatic effect can be of long duration.

Abstract: A manual film winding device of a camera has a winding lever which is manually rotated between a winding start position and a winding end position. Also provided are a ratchet mechanism having a ratchet wheel, which is rotated in association with the winding lever's rotation, and a ratchet pawl which engages with the ratchet wheel. The ratchet wheel rotates in a winding direction when the winding lever rotates from the winding start position to the winding end position, and in a reverse direction, opposite to the winding direction, when the winding lever rotates from the winding end position to the winding start position. A film advance driving system operates in association with the ratchet wheel's rotation in the winding direction. The ratchet pawl is arranged to rotate toward a first direction in connection with the winding rotation of the ratchet wheel, and to rotate toward a second direction in connection with the reverse rotation of the ratchet wheel.

Abstract: An optical filter, such as a low-pass filter, which is disposed between a photo-taking lens mounted on a mount part of the camera body having an image sensor disposed on an image forming plane and a main mirror disposed within the camera body, is held in position jointly by a holding member fixed to the lower end of a front aperture part of the camera body and an elastic member fixed to the rear side of the holding member with a resilient force applied to the optical filter. In mounting the photo-taking lens on the camera body, when an end part of the photo-taking lens comes to touch the optical filter, the optical filter is allowed to temporarily move to escape from the photo-taking lens and to come back to its original position upon completion of the lens mounting operation.