Abstract: An imaging lens assembly has an optical axis, and includes a plastic carrier element and an imaging lens element set. The plastic carrier element includes an object-side surface, an image-side surface, an outer surface and an inner surface. The object-side surface includes an object-side opening. The image-side surface includes an image-side opening. The inner surface is connected to the object-side opening and the image-side opening. The imaging lens element set is disposed in the plastic carrier element, and includes at least three lens elements, each of at least two adjacent lens elements of the lens elements includes a first axial assembling structure, the first axial assembling structures are corresponding to and connected to each other. A solid medium interval is maintained between the adjacent lens elements and the inner surface. The solid medium interval is directly contacted with the adjacent lens elements and the inner surface.

Abstract: An accessory that is mountable at a camera body and is capable of communicating with the camera body, includes: a transmission unit capable of transmitting information pertaining to a drive target member that is driven by a drive unit to the camera body according to at least one communication specification; and a reception unit that receives from the camera body a first value specifying a communication specification according to which the information is transmitted to the camera body, wherein: the transmission unit transmits the information pertaining to the drive target member to the camera body according to the communication specification specified by the first value.

Abstract: An accessory that is mountable at a camera body and is capable of communicating with the camera body, includes: a first transmission unit capable of transmitting information pertaining to a drive target member that is driven by a drive unit to the camera body according to at least one communication specification; and a second transmission unit that transmits to the camera body a first value specifying a communication specification according to which the information is transmitted to the camera body, wherein: the first transmission unit transmits the information pertaining to the drive target member to the camera body according to the communication specification specified by the first value.

Abstract: There is provided an information processing apparatus including a control unit that controls display on the basis of a detection value indicating a focus state of a lens acquired from a stereoscopic imaging unit, and a captured image signal for a left eye and a captured image signal for a right eye acquired from the imaging unit.

Abstract: An interchangeable lens includes: a mount on which a camera body can be mounted; a communication device that performs communication with the camera body; a driven member; a controller that controls the driven member; and a storage device that stores lens data related to control of the driven member by the controller. The controller sends to the camera body via the communication device lens-side judgment data based on the lens data and a parameter relating to the driven member received from the camera body via the communication device and based on which whether the lens data is considered to be properly stored in the storage device or not can be judged at the camera body.

Abstract: An imaging apparatus includes an imager configured to capture an object image, a photometric unit configured to measure a light amount incident on the imager, an acquisition unit configured to acquire a plurality of data indicating a relationship between the light amount incident on the imager and an adjustment amount set in a light amount adjustment unit in the imaging optical system and adjusts the light amount incident on the imager, and a determination unit configured to determine an exposure condition using the data acquired by the acquisition unit. The plurality of data includes first table data that provides a change amount of the light amount incident on the imager based on a change amount of the adjustment amount, and second table data that provides the change amount of the adjustment amount based on the change amount of the light amount incident on the imager.

Abstract: A finder is configured to be capable of observing a subject image through a finder lens. A finder information display section performs display of information in a state where the information is superimposed on the subject image, and displays first to third angle-of-view frames. The first angle-of-view frames are a plurality of angle-of-view frames corresponding to the focal lengths of all the imaging lenses mountable on the mount section. The second angle-of-view frames are a plurality of angle-of-view frames corresponding to the focal lengths of the imaging lenses previously mounted on the mount section. The third angle-of-view frame is an angle-of-view frame corresponding to the focal length of the imaging lens mounted on the mount section. By displaying the angle-of-view frames of all the imaging lenses mountable on the mount section, it is possible to easily find an imaging lens having the optimum focal length for the captured scene.

Abstract: A focusing apparatus includes an acquisition unit configured to acquire locus data that indicates a position of a focus lens that depends on an object distance and a position of a zoom lens, and an adjustment value used to adjust the position of the focus lens on the locus data, a correction unit configured to correct the adjustment value based on an aberration of an optical system that includes the zoom lens and the focus lens, and a control unit configured to control the position of the focus lens based on the locus data and the corrected adjustment value.

Abstract: An image capturing apparatus having an image sensor, that reads out an image signal from pixels of the image sensor, controls a region in which a plurality of image signals having different viewpoints are read out from pixels of the image sensor, acquires depth information using the image signals read out from the region, and records image information in which the image signals, the depth information and information regarding the region are associated with each other.

Abstract: The image pickup apparatus includes a focus detector to produce, by using a light from an object passing through an image-taking optical system, focus information indicating a focus state of the image-taking optical system, a light-receiving sensor including visible-light receiving elements each receiving the light from the object and respectively having sensitivity centroids in mutually different wavelength ranges of a visible wavelength range, and a controller. The light-receiving sensor includes, separately from the visible-light receiving elements, infrared receiving elements each having a sensitivity centroid in an infrared wavelength range. An infrared-cutting filter disposed on a light-entering side further than the light-receiving sensor has a half-value wavelength longer than a wavelength of the sensitivity centroid of the infrared receiving elements.

Abstract: The present invention relates to a distance measuring apparatus including an imaging device and a calculation unit calculating a distance to a subject on the basis of an electrical signal. The imaging device includes a signal acquisition unit that acquires a first electrical signal based on a beam that has passed through a first region off the center of the exit pupil in a predetermined direction; a second electrical signal based on a beam that has passed through a second region off the center of the exit pupil in a direction opposite to the predetermined direction; and a third electrical signal based on a beam that has passed through a region eccentric from the first region in the direction opposite to the predetermined direction. The calculation unit performs a signal correction process for generating a first corrected signal and a distance calculation process for calculating the distance.

Abstract: A focus detection apparatus includes the following: a viewing field mask disposed more on a photoelectric conversion element side than an expected imaging plane of an imaging lens and configured to determine contours of optical images formed on a detection plane, a sensor including a photoelectric conversion element disposed extending outside the optical images and including a plurality of pairs of focus detection regions in each of which the optical images are detected, a memory configured to store, as adjustment values, pieces of data indicating positions of effective ranges in the pairs of focus detection regions, in a plurality of storage areas in a way that each of the pieces of data is stored in a corresponding one of the storage areas, and a control unit configured to obtain the adjustment value data from the memory and perform focus detection for the imaging lens to control focus adjustment operation.

Abstract: A registration apparatus obtains, from an image pickup apparatus, identification information set in a lens apparatus that is attached to the image pickup apparatus. The registration apparatus pre-stores lens information including information that identifies the models of lens apparatuses and corresponding correction information, such that the lens information can be referenced by identification information. The registration apparatus displays a list of the stored lens apparatus models in a confirmation window such that the models of lens apparatuses corresponding to obtained identification information can be distinguished from the models of other lens apparatuses.

Abstract: The present invention relates to an autofocus device, and to a method therefor, whereby the delay necessary for auto focus can be reduced according to circumstances and a clear image of a subject can be obtained in a timely fashion by suitably adjusting the precision and speed of autofocus, as auto focus settings are differently applied in accordance with the photography mode when autofocus is being implemented in a camera. To this end, the autofocus method according to an embodiment of the present invention comprises: a step of inputting a photography mode for a subject; a step of deciding which auto focus setting corresponds to the input photography mode; a step of determining the lens step with the highest focal value among lens steps set according to the distance of the subject and the lens on the basis of the auto focus setting decided upon; and a step of moving the lens to the determined lens step.

Abstract: Embodiments of the present invention initially calculate a confidence score for the image environment surrounding the subject matter in order to determine the initial number of lens positions. Once the initial lens positions are determined, a sharpness score is calculated for each determined initial lens position. Using these sharpness scores, embodiments of the present invention generate a projection used to locate an estimated optimum focus position as well as to determine an estimated sharpness score at this lens position. Embodiments of the present invention then position the lens of the camera to calculate the actual sharpness score at the estimated optimum focus position, which is then compared to the estimated optimum sharpness score previously calculated. Based on this comparison, embodiments of the present invention dynamically determine whether it has a sufficient number of lens positions to determine the optimum focus position or if additional sample lens positions are needed.

Abstract: A registration apparatus obtains, from an image pickup apparatus, identification information set in a lens apparatus that is attached to the image pickup apparatus. The registration apparatus pre-stores lens information including information that identifies the models of lens apparatuses and corresponding correction information, such that the lens information can be referenced by identification information. The registration apparatus displays a list of the stored lens apparatus models in a confirmation window such that the models of lens apparatuses corresponding to obtained identification information can be distinguished from the models of other lens apparatuses.

Abstract: This invention provides a system and method for determining and controlling focal distance in a lens assembly of a vision system camera using an integral calibration assembly that provides the camera's image sensor with optical information that is relative to focal distance while enabling runtime images of a scene to be acquired along the image axis. The lens assembly includes a variable lens located along an optical axis that provides a variable focus setting. The calibration assembly generates a projected pattern of light that variably projects upon the camera sensor based upon the focus setting of the variable lens. That is, the appearance and/or position of the pattern varies based upon the focus setting of the variable lens. This enables a focus process to determine the current focal length of the lens assembly based upon predetermined calibration information stored in association with a vision system processor running the focus process.

Abstract: An image sensing apparatus on which a plurality of lens units are interchangeably mountable includes a system controller configured to acquired information specific to a mounted lens unit from the mounted lens unit, a detection unit configured to detect a focus shift amount of the mounted lens unit, a display circuit configured to display the specific information acquired by the system controller in association with a focus correction value for correcting the focus shift amount detected by the detection unit, an operation switch configured to be operated by a user, and a setting unit that sets the focus correction value according to an operation on the operation switch.

Abstract: An image sensing apparatus on which a plurality of lens units are interchangeably mountable includes a system controller configured to acquired information specific to a mounted lens unit from the mounted lens unit, a detection unit configured to detect a focus shift amount of the mounted lens unit, a display circuit configured to display the specific information acquired by the system controller in association with a focus correction value for correcting the focus shift amount detected by the detection unit, an operation switch configured to be operated by a user, and a setting unit that sets the focus correction value according to an operation on the operation switch.

Abstract: The image pickup system includes a camera and an interchangeable lens having an image-taking optical system. The camera includes an image sensor to photoelectrically convert an object image formed by the image-taking optical system and to be moved in an optical axis direction, and a camera controller configured to control movement of the image sensor such that focus variation caused due to variation of magnification of the interchangeable lens is reduced. The camera controller is configured to acquire image sensor moving data corresponding to the interchangeable lens attached to the camera, and controls the movement of the image sensor by using the image sensor moving data.

Abstract: An image sensing apparatus on which a plurality of lens units are interchangeably mountable includes a system controller configured to acquired information specific to a mounted lens unit from the mounted lens unit, a detection unit configured to detect a focus shift amount of the mounted lens unit, a display circuit configured to display the specific information acquired by the system controller in association with a focus correction value for correcting the focus shift amount detected by the detection unit, an operation switch configured to be operated by a user, and a setting unit that sets the focus correction value according to an operation on the operation switch.

Abstract: An electronic image pickup apparatus includes a plurality of lens units, an image forming optical system, and an image pickup element. The image forming optical system includes at least a lens unit nearest to object side which is disposed nearest to an object side, an aperture stop which is disposed on an image side than the lens unit nearest to object side, and an image-side lens unit which is disposed on the image side than the aperture stop. The lens unit nearest to object side includes a lens having a mark formed on an effective area of a lens surface thereof. At least any one of the lens in the image forming optical system is held such that, a shifting or a tilting of the lens can be adjusted.

Abstract: An imaging apparatus that determines in-focus conditions according to a user's taste by using auto-focus (AF). The imaging apparatus including an AF unit, that allows the user to input an in-focus operation start command, and that allows the user to input a main photographing start command. The imaging apparatus includes a photographing environment storing unit that stores photographing stop and start data, an assumed in-focus condition group generating unit that generates an assumed in-focus condition group based on at least the photographing stop data, an assumption confirming unit that confirms the assumed in-focus condition group, and an in-focus condition group changing unit that, if an in-focus success rate for the assumed in-focus condition group is higher than for the default in-focus condition group, changes the default in-focus condition group to the assumed in-focus condition group.

Abstract: An imaging apparatus includes an imaging element, a communication unit, an automatic adjustment mechanism and a camera controller. The communication unit receives lens-side information from a lens apparatus. The automatic adjustment mechanism adjusts a position of the imaging element. The camera controller controls the position of the imaging element, which is adjusted by the automatic adjustment mechanism according to a spherical aberration variation, based on the lens-side information.

Abstract: A camera system includes a camera body, an interchangeable lens, and an accessory to be mounted between the camera body and the interchangeable lens, wherein the accessory includes a signal processing unit configured to process a signal input into the accessory, a storage unit configured to store information used for performing the signal processing, and a blocking unit configured to prevent direct communication from the camera body to the interchangeable lens when the information stored in the storage unit is rewritten via the camera body.

Abstract: A camera system including a camera body, an interchangeable lens, and an accessory mounted between the camera body and the interchangeable lens, wherein the accessory has a signal processing unit configured to process a signal input into the accessory and a storage unit configured to store information to be used when performing the signal processing, the camera system further including a pseudo interchangeable lens which can be mounted on the accessory instead of the interchangeable lens and which is configured to supply power from the camera body to the accessory when mounted on the camera body via the accessory, and a control unit configured to, while the camera body, the accessory, and the pseudo interchangeable lens are connected, when the accessory receives within a predetermined duration predetermined information, enable communication between the camera body and the accessory even after the predetermined duration has elapsed, and rewrite the information stored in the storage unit.

Abstract: A lens-interchangeable camera includes a focus detector performing focus detection and a controller performing a drive control of a lens based on a defocus amount. The controller finishes focusing operation without driving the lens when the defocus amount is out a range of a first in-focus determination width, and performs the focusing operation when the defocus amount is out a range of the first in-focus determination width. The controller finishes the focusing operation without performing the focus detection again after completing the drive when the defocus amount is out a range of a second in-focus determination width, and performs the focus detection again after completing the drive when the defocus amount is out a range of the second in-focus determination width. The second in-focus determination width is set to be greater than the first in-focus determination width and be greater than or equal to a drive limit value.

Abstract: A lens barrel showing a satisfactory property in assembly and a high dust-proof and drip-proof performance includes: a first member; a lens holding frame configured to hold lens units moving in an optical axis direction to either zoom or focus the lens units; and an elastic member held between respective optical-axis-orthogonal surfaces of the first member and the lens holding frame, wherein the elastic member can be compressed in the optical axis direction during a zooming or focusing operation.

Abstract: There is provided an imaging apparatus including an imaging element, a communication unit that receives lens-side information from a lens apparatus, an automatic adjustment mechanism that adjusts a position of the imaging element, and a camera controller that controls the position of the imaging element, which is adjusted by the automatic adjustment mechanism according to a spherical aberration variation, based on the lens-side information.

Abstract: A lens barrel unit includes gyro sensors that detect vibration. The gyro sensors are disposed around a CCD mounting portion within a range over which the lens barrel unit is projected along the optical axis of a photographic optical system. This positional arrangement allows the lens barrel unit to be provided as a compact retractable unit, and ultimately achieves miniaturization of the camera.

Abstract: An imaging system includes an imaging apparatus which is provided with an imaging device and a mount adaptor which adjusts a flange focal length between the imaging apparatus and an interchangeable lens, wherein the mount adaptor is provided with a phase difference focus detection section which performs focus detection from a phase difference and an optical device which splits incident light from the interchangeable lens into incident light of the imaging device and incident light of the phase difference focus detection section, and the imaging apparatus is provided with a contrast focus detection section which performs focus detection from contrast using the imaging device, an adjustment section which adjusts the focus position of the phase difference focus detection section, and an adjustment control section which activates adjustment control of the focus position using detection of the mounting of the mount adaptor and the interchangeable lens.

Abstract: An optical device includes a shooting optical system including an AF lens, an AF lens driving apparatus for driving the AF lens, a detection unit for detecting a defocus amount corresponding to a difference between an image pickup position of an object and an imaging position of the object which is formed by the shooting optical system, and a control unit for drive-controlling the AF lens driving apparatus to reduce the defocus amount. The control unit detects a shooting magnification of the shooting optical system and changes a method of controlling the AF lens driving apparatus to reduce the defocus amount based on the shooting magnification.

Abstract: A lens-interchangeable camera includes a focus detector performing focus detection and a controller performing a drive control of a lens based on a defocus amount. The controller finishes focusing operation without driving the lens when the defocus amount is out a range of a first in-focus determination width, and performs the focusing operation when the defocus amount is out a range of the first in-focus determination width. The controller finishes the focusing operation without performing the focus detection again after completing the drive when the defocus amount is out a range of a second in-focus determination width, and performs the focus detection again after completing the drive when the defocus amount is out a range of the second in-focus determination width. The second in-focus determination width is set to be greater than the first in-focus determination width and be greater than or equal to a drive limit value.

Abstract: A camera apparatus and a camera system of the present invention are configured so that a lens unit is attachable/detachable. The lens unit contains at least a lens and an iris, and contains a memory storing setting information required for operating the lens and the iris. When a camera microcomputer checks detection information stored in a memory in a sub-microcomputer at a time of start-up of the camera apparatus, and first detection information is stored in the memory, the setting information is acquired from the lens unit. When second detection information is stored in the memory, the setting information is acquired from another memory in the camera apparatus. Due to this configuration, the time for shifting the switch-on to a photographable state is shortened, and the ease of convenience can be enhanced.

Abstract: An auto focus (AF) adjusting apparatus and a camera system of a lens replaceable camera are disclosed. AF is performed by correcting a location error of a focus lens due to a difference between a frequency band for performing AF detection and a frequency band for determining an improved location of an image surface of an imaging lens, and/or a target region for detecting a focal point.

Abstract: An image pickup apparatus 100 includes a memory 52 that stores information on an object distance obtained from an interchangeable lens 220 mounted on the image pickup apparatus and a memory controller 50 that retains the information on the object distance in the memory also after the interchangeable lens is removed from the image pickup apparatus. The image pickup apparatus of a changing-lenses type in which an object in-focus at a same distance can be obtained in a short time when lenses are changed is provided.

Abstract: A camera is provided which is adapted to receive a photographic lens having a diaphragm. The camera includes a detection unit configured to execute electric charge accumulation for detecting a defocus amount when the diaphragm is in a state having a first aperture value, and a controller configured to, when causing the diaphragm to perform an aperture reducing operation from the first aperture value to a second aperture value, cause the diaphragm to start the aperture reducing operation without waiting for completion of the electric charge accumulation for detecting the defocus amount by the detection unit.

Abstract: A camera apparatus and a camera system of the present invention are configured so that a lens unit is attachable/detachable. The lens unit contains at least a lens and an iris, and contains a memory storing setting information required for operating the lens and the iris. When a camera microcomputer checks detection information stored in a memory in a sub-microcomputer at a time of start-up of the camera apparatus, and first detection information is stored in the memory, the setting information is acquired from the lens unit. When second detection information is stored in the memory, the setting information is acquired from another memory in the camera apparatus. Due to this configuration, the time for shifting the switch-on to a photographable state is shortened, and the ease of convenience can be enhanced.

Abstract: An interchangeable lens type digital camera includes a camera main body and an interchangeable lens. The camera main body includes a control section which communicates with an interchangeable lens, and controls focus adjustment of the interchangeable lens by a hill-climbing AF system. A judgment section judges a characteristic of the interchangeable lens on the basis of communication between the interchangeable lens and the control section. The interchangeable lens includes a focus lens for performing focus adjustment. A focus lens drive section drives the focus lens. A lens control section communicates with the control section, and controls the focus lens drive section to perform focus adjustment. The control section changes a previously determined drive enabled range of the focus lens on the basis of a judgment result of the judgment section to perform focus adjustment of the interchangeable lens.

Abstract: A camera apparatus and a camera system of the present invention are configured so that a lens unit is attachable/detachable. The lens unit contains at least a lens and an iris, and contains a memory storing setting information required for operating the lens and the iris. When a camera microcomputer checks detection information stored in a memory in a sub-microcomputer at a time of start-up of the camera apparatus, and first detection information is stored in the memory, the setting information is acquired from the lens unit. When second detection information is stored in the memory, the setting information is acquired from another memory in the camera apparatus. Due to this configuration, the time for shifting the switch-on to a photographable state is shortened, and the ease of convenience can be enhanced.

Abstract: There is disclosed a digital camera which detects a focus of a lens unit by a method selected from a plurality of focus detection methods based on information on the lens unit taken from the lens unit attached to the digital camera. As an example of a focus detection method, there is a method by a phase difference system or a contrast system, but the method is not limited to this example.

Abstract: An image sensing apparatus on which a plurality of lens units are interchangeably mountable includes a system controller configured to acquired information specific to a mounted lens unit from the mounted lens unit, a detection unit configured to detect a focus shift amount of the mounted lens unit, a display circuit configured to display the specific information acquired by the system controller in association with a focus correction value for correcting the focus shift amount detected by the detection unit, an operation switch configured to be operated by a user, and a setting unit that sets the focus correction value according to an operation on the operation switch.

Abstract: Disclosed is a focus detecting apparatus detecting an image offset of an optical system. The apparatus comprises a micro lens array arranged with a plurality of micro lenses, a photo-detector having a plurality of detecting elements provided so as to correspond to each of the plurality of micro lenses and receiving an optical beam from the optical system via the micro lenses, and a calculator that selects a pair of detecting elements from the plurality of detecting elements in accordance with a plurality of aperture values of the optical system and calculates an image offset of the optical system based on outputs from the pair of detecting elements. The pair of detecting elements receive respectively a pair of optical beams passing through different areas of the optical system.

Abstract: An image sensing apparatus including: an image sensor including a plurality of focus detection pixel pairs that perform photoelectric conversion on each pair of light beams that have passed through different regions of a photographing lens and output an image signal pair; a flash memory that stores shift information on relative shift between an optical axis of the photographing lens and a central axis of the focus detection pixel pairs; a correction unit that corrects a signal level of the image signal pair based on the shift information and exit pupil information of the photographing lens so as to compensate for an unbalanced amount of light that enters each of the focus detection pixel pairs; and a focus detection unit that detects a focus of the photographing lens using the image signal pair corrected by the correction unit.

Abstract: An image sensing apparatus on which a plurality of lens units are interchangeably mountable includes a system controller configured to acquired information specific to a mounted lens unit from the mounted lens unit, a detection unit configured to detect a focus shift amount of the mounted lens unit, a display circuit configured to display the specific information acquired by the system controller in association with a focus correction value for correcting the focus shift amount detected by the detection unit, an operation switch configured to be operated by a user, and a setting unit that sets the focus correction value according to an operation on the operation switch.

Abstract: The portable terminal with camera comprises: a first housing and a second housing which are movably connected to each other; an image pickup device which is arranged in one of the first housing and the second housing; and a conversion lens which is arranged in the other of the first housing and the second housing. In a first state where the first housing and the second housing are laid on each other, the image pickup device and the conversion lens have an identical optical axis so that a focal length of the image pickup device is converted from a focal length in a second state where the first housing and the second housing are arranged to each other differently than the first state. Thus, the focal length can be converted using a simple arrangement, so as to easily switch between image-capturing of a distant object as with ordinary cameras and image-capturing of an operator's face or the like.

Abstract: This invention provides a technique of stably focusing on a major object without any sense of discomfort regardless of differences in lens unit type in a camera body on which a lens unit can be detachably mounted. For this purpose, the type of lens unit connected to the camera is determined. Cutoff frequencies are then set for a low-pass filter and high-pass filter on the basis of the determination result. With regard to frequency component data in predetermined area of an image sensor, a peak hold circuit, integrator, and difference peak hold circuit each generate evaluate value information. A camera microcomputer transmits the obtained evaluate value information to a lens microcomputer in the lens unit.

Abstract: A focusing controlling device is for a camera having a photographing lens and an imaging surface. The focusing controlling device includes a focus adjuster that adjusts a focus position of the photographing lens based on field curvature data. The field curvature data indicates a field curvature ratio which is a ratio of a distance between an image point of light transmitted through the photographing lens and the imaging surface to a focal distance of the photographing lens, the field curvature data being set for a partial area of the imaging surface as an average value of the field curvature ratios for the partial area.

Abstract: A taking lens capable of being used for photographing by light in each of at least two wavelength regions including a first wavelength region and a second wavelength region is provided and include: the flange back adjusting lens; a storing unit that stores a correcting amount of the flange back adjusting lens in photographing by light in the second wavelength region; and the lens driving unit. When the taking lens is used in photographing by light in the first wavelength region, the lens driving unit moves the flange back adjusting lens to a set position adjusted at the flange back; and when the taking lens is used in photographing by light in the second wavelength region, the lens driving unit moves the flange back adjusting lens based on the correcting amount so that an image location in photographing by light in the second wavelength region coincides with an image location in photographing by light in the first wavelength region.

Abstract: A digital camera has distance measurement zone setting means (12) for dividing distance to a subject into a plurality of distance measurement zones; distance measurement zone selection means (13) for selecting a distance measurement zone to be scanned; an autofocus evaluation calculation circuit (14) for acquiring an AF evaluation value by scanning the selected distance measurement zone; zone-update determination means (15) for determining, through use of the AF evaluation value, whether or not to update a distance measurement zone to be scanned; and in-focus position decision means (16) for appropriately updating the scanned distance measurement zone based upon the determination as to whether to update the distance measurement zone, and deciding an in-focus position based upon acquisition of AF evaluation value. A focusing lens (2) is driven to the in-focus position by a focusing-lens drive circuit (17).