Lens device and method for controlling the same

Abstract

To excellently reduce a change in a field angle caused by focusing regardless of the presence or absence of aberration correction processing.SOLUTION: A lens device 100 is detachably attached to an imaging apparatus 200. The lens device includes a zoom lens including a focus lens 101 moving for focusing and a variable power lens 102 moving for varying power and processing means 120 for performing lens field angle correction processing for driving the variable power lens to reduce a change in a field angle of the zoom lens caused by movement of the focus lens. The processing means changes the lens field angle correction processing according to whether or not aberration correction processing for reducing aberration of the zoom lens is performed to image data in the imaging apparatus.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lens device having a zoom lens.

Background Art

[0002] Some zoom lenses used in imaging devices such as video cameras exhibit an angle-of-view change (breathing) associated with focusing. This angle-of-view change is caused by changes in the imaging magnification and distortion aberration as the focus lens moves, and is particularly noticeable in video imaging.

[0003] Patent Document 1 discloses a lens device that cancels an angle-of-view change by moving a variable magnification lens in accordance with the movement of a focus lens. Patent Document 2 discloses an imaging device that changes the magnification of imaging image data according to the relationship between correction data for correcting an angle-of-view change associated with focusing and correction data for correcting distortion aberration.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the lens device of Patent Document 1, the change in the angle of view due to the aberration correction process (image processing) performed to correct the distortion aberration in the imaging device is not considered. Further, in the imaging device of Patent Document 2, it is premised that the distortion aberration is corrected, and if the distortion aberration is not corrected, the correction of the angle-of-view change associated with focusing is not performed either.

[0006] The present invention provides a lens device capable of satisfactorily reducing the change in the angle of view associated with focusing regardless of the presence or absence of aberration correction processing in an imaging device.

Means for Solving the Problems

[0007] A lens device according to one aspect of the present invention is detachably attached to an imaging device. The lens device includes a zoom lens including a focus lens that moves for focusing and a zoom lens that moves for zooming, and processing means for performing lens angle-of-view correction processing for driving the zoom lens to reduce the change in the angle of view of the zoom lens associated with the movement of the focus lens. The processing means is characterized by changing the lens angle-of-view correction processing according to whether or not aberration correction processing for reducing the aberration of the zoom lens with respect to image data is performed in the imaging device. Note that an imaging device to which the lens device is detachably attached and in which the setting of the validity and invalidity of aberration correction processing is possible also constitutes another aspect of the present invention.

[0008] A control method according to another aspect of the present invention is applied to a lens device that is detachably attached to an imaging device and has a zoom lens including a focus lens that moves for focusing and a zoom lens that moves for zooming. The control method includes a step of performing lens angle-of-view correction processing for driving the zoom lens to reduce the change in the angle of view of the zoom lens associated with the movement of the focus lens, and a step of changing the lens angle-of-view correction processing according to whether or not aberration correction processing for reducing the aberration of the zoom lens with respect to image data is performed in the imaging device. Note that a program for causing a computer of the lens device to execute the processing according to the above control method also constitutes another aspect of the present invention.

Effects of the Invention

[0009] According to the present invention, it is possible to satisfactorily reduce the change in the angle of view associated with focusing regardless of the presence or absence of aberration correction processing in the imaging device.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 8

Figure 9

Figure 10

Figure 11

Best Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each embodiment, the case where an interchangeable lens as a lens device is detachably attached to an imaging device such as a digital camera will be described. The interchangeable lens of each embodiment has a zoom lens as an imaging optical system, and the zoom lens causes an angle-of-view change associated with focusing (hereinafter referred to as a focus angle-of-view change).

Embodiment

[0012] FIG. 1 shows an imaging system composed of an interchangeable lens 100 of Example 1 and a digital camera 200.

[0013] In the interchangeable lens 100, the zoom lens includes a focus lens group 101 that moves for focusing, a zoom lens group 102 that moves for zooming (changing magnification), a diaphragm 103 with a variable aperture diameter, and a relay lens group 104 for imaging. A lens group is a collection of one or more lenses that move during zooming and focusing, and the distance between adjacent lens groups changes during zooming and focusing. Note that the lens (focus sub-lens group) that moves for focusing may be part of the lens group closest to the object side.

[0014] The zoom lens of this embodiment is a front focus type zoom lens in which the focus lens group 101 is arranged on the object side most. However, the zoom lens may be an inner focus (rear focus) type in which the focus lens group is arranged on the image side with respect to the lens group closest to the object side. The zoom lens group 102 may be composed of a plurality of lens groups whose distances change during zooming.

[0015] The position of the focus lens group 101 is detected by the focus position detection unit 110. The position of the zoom lens group 102 is detected by the zoom position detection unit 111. The setting unit 112 sets whether to correct the change in the focus angle of view. The focus drive unit 113 and the zoom drive unit 114 each include an actuator such as a motor that drives the focus lens group 101 and the zoom lens group 102.

[0016] The lens arithmetic unit 120 as processing means is configured as a computer including a CPU or the like, and performs various processes within the interchangeable lens 100. The lens communication unit 130 transmits and receives information to and from the digital camera 200. The correction data storage unit (storage means) 140 is composed of a non-volatile memory or the like, and stores correction data for reducing (correcting) the change in the focus angle of view. The correction data is data indicating the position to move the zoom lens group 102 in order to correct the change in the focus angle of view generated by the movement (position change) of the focus lens group 101.

[0017] In digital camera 200, camera operation unit 210 is configured as a computer including a CPU or the like, and performs various processes within digital camera 200. Camera communication unit 220 communicates information with interchangeable lens 100. Distortion correction information generation unit 230 generates information indicating the setting of enabling (ON) / disabling (OFF) of the distortion correction process in digital camera 200. The enabling / disabling of the distortion correction process is set by a user operation on digital camera 200.

[0018] Image pickup device 240 is a photoelectric conversion element such as a CCD sensor or a CMOS sensor that photoelectrically converts a subject image formed by a zoom lens. Camera operation unit 210 generates a captured image (image data) by performing various image processes on the electrical signal (imaging signal) from image pickup device 240. Further, when the distortion correction process is enabled, camera operation unit 210 performs a distortion correction process (aberration correction process) as an image process for reducing (correcting) the distortion aberration of the zoom lens included in the image data on the image data.

[0019] Note that in this embodiment, a case where digital camera 200 can perform an aberration correction process for correcting the distortion aberration in the image data will be described. However, the aberration correction process performed by the digital camera may be a process for correcting aberrations other than the distortion aberration.

[0020] The distortion correction process will be described with reference to FIGS. 3(a) to (c). FIG. 3(a) shows image data 300 before the distortion correction process, and this image data includes barrel distortion. In the distortion correction process for image data 300, a process of canceling out the distortion aberration component for each image height is performed. Specifically, in image data 300, a magnification process with different magnifications for each image height (an enlargement process for barrel distortion) is performed. FIG. 3(b) shows image data 301 after the distortion correction process. For barrel distortion, a positive-side distortion correction process is performed, and as a result, the number of pixels constituting the image data increases.

[0021] Next, in order to generate image data with the same pixel size as before the distortion correction, as shown in FIG. 3(c), an area 302 with the same number of pixels as before the distortion correction is cut out (cropped) from the image data 301 after the distortion correction process. As a result, finally, as shown in FIG. 3(d), image data 302 with the same pixel size as the image data 300 before the distortion correction process is generated. In this case, the angle of view corresponding to the image data 302 after the distortion correction process becomes narrower than the angle of view corresponding to the image data 300 before the distortion correction process. That is, the angle of view changes according to whether the distortion correction process is effective or not.

[0022] Therefore, in this embodiment, in order to correct the focus angle-of-view change according to whether the distortion correction process is effective or not, the lens angle-of-view correction process (the position and driving amount for driving the zoom lens group 102) for driving the zoom lens group 102 is changed. Specifically, in this embodiment, the lens angle-of-view correction process is changed by changing the correction data used for the lens angle-of-view correction process according to whether the distortion correction process is effective or not.

[0023] Note that when the lens angle-of-view correction process is performed without using correction data, the lens angle-of-view correction process may be changed without changing the correction data according to whether the distortion correction process is effective or not.

[0024] FIG. 2 shows the lens angle-of-view correction process (control method) executed by the lens arithmetic unit 120 in this embodiment. The lens arithmetic unit 120 executes this process according to a program.

[0025] In step S101, the lens arithmetic unit 120 acquires the determination result of whether to correct the focus angle-of-view change from the setting unit 112. If the lens arithmetic unit 120 corrects the focus angle-of-view change, it proceeds to step S102, and if it does not correct the focus angle-of-view change, this process ends.

[0026] In step S102, the lens arithmetic unit 120 acquires the effectiveness or ineffectiveness of the distortion correction process in the digital camera 200 from the distortion correction information generation unit 230.

[0027] In step S103, the lens arithmetic unit 120 determines whether the distortion correction process in the digital camera 200 is valid or invalid. If it is valid, the process proceeds to step S104; if it is invalid, the process proceeds to step S105 respectively.

[0028] In step S104, the lens arithmetic unit 120 sets the correction data for correcting the focus angle of view change to correction data A used when the distortion correction process is valid. Then the process proceeds to step S106.

[0029] In step S105, the lens arithmetic unit 120 sets the correction data for correcting the focus angle of view change to correction data B used when the distortion correction process is invalid. Then the process proceeds to step S106.

[0030] In step S106, the lens arithmetic unit 120 reads the correction data A or correction data B set in step S104 or step S105 from the correction data storage unit 140.

[0031] In step S107, when the focus lens group 101 is driven, the lens arithmetic unit 120 calculates the driving amount of the zoom lens group 102 from the position of the focus lens group 101 and the correction data A or B.

[0032] Next, in step S108, the lens arithmetic unit 120 drives the zoom lens group 102 according to the driving amount calculated in step S107. Thereby, the change in the focus angle of view is corrected.

[0033] As described above, in this embodiment, the correction data used for correcting the change in the focus angle of view is switched according to whether the distortion correction process in the digital camera 200 is performed or not. Thereby, the change in the focus angle of view can be corrected well regardless of whether the distortion correction process is performed or not.

Embodiment

[0034] Next, Example 2 will be described. FIG. 4 shows the configuration of an imaging system including an interchangeable lens 100A and a digital camera 200. In this example, the interchangeable lens 100A is different from Example 1 in that it has a distortion correction setting unit (setting means) 115. The distortion correction setting unit 115 sets the validity / invalidity of the distortion correction process for the digital camera 200 according to the user's operation on the interchangeable lens 100A.

[0035] The lens angle-of-view correction process in this example is the same as that in Example 1 (FIG. 2).

[0036] Also in this example, the correction data used for correcting the focus angle-of-view change is switched according to the presence or absence of the distortion correction process in the digital camera 200. Thereby, the focus angle-of-view change can be corrected well regardless of the presence or absence of the distortion correction process.

Example

[0037] Next, Example 3 will be described. The configuration of the imaging system in this example is the same as that in Example 1 (FIG. 1), but the lens angle-of-view correction process is different from that in Example 1 (FIG. 2) as shown in the flowchart of FIG. 5.

[0038] In this example, the correction data storage unit 140 stores basic correction data (first data) as correction data for driving the zoom lens group 102 to correct the focus angle-of-view change. The basic correction data corresponds to the correction data A used when the distortion correction process described in Example 1 is effective. Also, the correction data storage unit 140 stores difference data (second data) combined with the basic correction data to generate correction data (corresponding to the correction data B in Example 1) used when the distortion correction process is ineffective.

[0039] Both the basic correction data and the difference data are composed of two-dimensional table data corresponding to the positions of the focus lens group 101 and the zoom lens group 102. In this embodiment, the number of positions of the focus lens group 101 and the zoom lens group 102 that hold differences in the difference data is set to be smaller than that in the basic correction data. That is, the data volume of the difference data is smaller than that of the basic correction data. Therefore, compared with the case where the correction data A and the correction data B corresponding to whether the distortion correction process is effective or not are stored in the correction data storage unit 140 as in the first embodiment, the capacity of the data stored in the correction data storage unit 140 can be reduced.

[0040] Steps S201 to S203 in FIG. 5 are the same as steps S101 to S103 in FIG. 1.

[0041] The lens arithmetic unit 120 determines whether the distortion correction process in the digital camera 200 is effective or not in step S203. If it is effective, it proceeds to step S204, and if it is not effective, it proceeds to step S205.

[0042] In step S204, the lens arithmetic unit 120 sets the correction data for correcting the focus angle of view change as the basic correction data. Then, the lens arithmetic unit 120 proceeds to step S207, reads the basic correction data from the correction data storage unit 140, and proceeds to step S208.

[0043] On the other hand, in step S205, the lens arithmetic unit 120 reads the basic correction data and the difference data from the correction data storage unit 140.

[0044] Next, in step S206, the lens arithmetic unit 120 combines the read basic correction data and difference data. Specifically, it adds the difference data to the basic correction data to generate correction data (hereinafter referred to as addition correction data) used when the distortion correction process is ineffective. Then, the lens arithmetic unit 120 proceeds to step S207, reads the addition correction data, and proceeds to step S208.

[0045] In step S208, when the focus lens group 101 is driven, the lens arithmetic unit 120 calculates the driving amount of the zoom lens group 102 based on the position of the focus lens group 101 and the basic correction data or addition correction data read in step S207.

[0046] Next, in step S209, the lens arithmetic unit 120 drives the zoom lens group 102 according to the driving amount calculated in step S208. Thereby, the change in the focus angle of view is corrected.

[0047] Also in this embodiment, the correction data used for correcting the change in the focus angle of view is switched according to whether or not the distortion correction process is performed in the digital camera 200. Thereby, the change in the focus angle of view can be corrected well regardless of whether or not the distortion correction process is performed. Further, in this embodiment, by combining the basic correction data and the difference data, addition correction data used when the distortion correction process is invalid is generated. Thereby, the capacity of the data stored in the correction data storage unit 140 can be suppressed.

[0048] In this embodiment, the case where the basic correction data is used as the correction data when the distortion correction process is valid has been described. However, the basic correction data may be used as the correction data when the distortion correction process is invalid. In this case, the correction data used when the distortion correction process is valid is generated by combining the basic correction data and the difference data.

[0049] Further, the correction data A may be generated by combining the basic correction data for the correction data A and the difference data. Also in this case, it is preferable that the data capacity of the difference data is smaller than that of the basic correction data.

Embodiment

[0050] Next, Example 4 will be described. FIG. 6 shows the configuration of an imaging system including an interchangeable lens 100 and a digital camera 200A. In this example, the digital camera 200A is different from Example 1 in that it has an imaging area setting unit 250. The imaging area setting unit 250 sets an imaging area. The imaging area is an area of different sizes from each other, such as an area corresponding to a 35 mm full size or an area corresponding to APS-C (Advanced Photo System type C) on the imaging surface of the image sensor 240. The imaging area is set according to a user operation on the digital camera 200A.

[0051] When the zoom lens has a thread-wound type distortion aberration, the correction is a negative side correction, and the number of pixels constituting the image data decreases. Finally, in order to output image data with the same pixel size as before the distortion correction process, a process of enlarging the image data after the distortion correction process so that it has the same number of pixels as before the distortion correction process is performed. The magnification at this time varies according to the imaging area. Therefore, in this example, correction data for correcting the focus angle of view change is changed according to the imaging area.

[0052] FIG. 7 shows the lens angle of view correction process executed by the lens arithmetic unit 120 in this example. Steps S701 and S702 in FIG. 7 are the same as steps S101 and S102 in FIG. 1.

[0053] In step S703, the lens arithmetic unit 120 acquires information on the set imaging area from the imaging area setting unit 250.

[0054] Next, in step S704, the lens arithmetic unit 120 determines whether the distortion correction process in the digital camera 200 is valid or invalid and determines the imaging area. If the distortion correction process is valid and the imaging area is the imaging area A corresponding to 35 mm full size, the process proceeds to step S705, and if it is the imaging area C corresponding to APS-C, the process proceeds to step S706, respectively. On the other hand, if the distortion correction process is invalid, the process proceeds to step S707.

[0055] In the next step S708 after step S705, the lens arithmetic unit 120 sets correction data for correcting the change in the focus angle of view to correction data A corresponding to the imaging area A, and proceeds to step S710.

[0056] Also, in the next step S709 after step S706, the lens arithmetic unit 120 sets the correction data to correction data C corresponding to the imaging area C, and proceeds to step S710.

[0057] In step S707, the lens arithmetic unit 120 sets correction data for correcting the change in the focus angle of view to correction data B, and proceeds to step S710.

[0058] In step S710, the lens arithmetic unit 120 reads the correction data A, correction data C, or correction data B set in step S708, step S709, or step S707 from the correction data storage unit 140.

[0059] In step S711, when the focus lens group 101 is driven, the lens arithmetic unit 120 calculates the driving amount of the zoom lens group 102 from the position of the focus lens group 101 and the correction data A, B, or C.

[0060] Next, in step S712, the lens arithmetic unit 120 drives the zoom lens group 102 according to the driving amount calculated in step S711. Thereby, the change in the focus angle of view is corrected.

[0061] In this embodiment, the correction data used for correcting the change in the focus angle of view is switched according to the presence or absence of the distortion correction process in the digital camera 200 and the imaging area. Thereby, the change in the focus angle of view can be corrected well regardless of the presence or absence of the distortion correction process and the imaging area.

Example

[0062] Next, Example 5 will be described. FIG. 8 shows the configuration of an imaging system including an interchangeable lens 100B and a digital camera 200. In this example, the interchangeable lens 100B is different from Example 1 in that the focal length range of the zoom lens can be shifted by inserting and removing an extender group 105 as an optical unit into the zoom lens (relay lens group 104).

[0063] FIG. 9 shows the lens field angle correction process executed by the lens arithmetic unit 120 in this example. Step S901 and step S902 in FIG. 9 are the same as step S101 and step S102 in FIG. 1.

[0064] In step S903, the lens arithmetic unit 120 determines whether the extender group 105 is inserted into the zoom lens. If it is not inserted, the process proceeds to step S904, and if it is inserted, the process proceeds to step S905, respectively.

[0065] In step S904, the lens arithmetic unit 120 determines whether the distortion correction process in the digital camera 200 is valid or invalid. If it is valid, the process proceeds to step S906, and if it is invalid, the process proceeds to step S907.

[0066] In step S906, the lens arithmetic unit 120 sets the correction data for correcting the focus field angle change to the correction data A used when the extender group 105 is not inserted and the distortion correction process is valid. Then the process proceeds to step S910.

[0067] In step S907, the lens arithmetic unit 120 sets the correction data for correcting the focus field angle change to the correction data B used when the extender group 105 is not inserted and the distortion correction process is invalid. Then the process proceeds to step S910.

[0068] On the other hand, in step S905, the lens arithmetic unit 120 determines whether the distortion correction process in the digital camera 200 is valid or invalid. If it is valid, the process proceeds to step S908, and if it is invalid, the process proceeds to step S909.

[0069] In step S906, the lens arithmetic unit 120 sets correction data for correcting the focus angle of view change to correction data A' that is used when the extender group 105 is inserted and the distortion correction process is effective. Then, the process proceeds to step S910.

[0070] In step S907, the lens arithmetic unit 120 sets correction data for correcting the focus angle of view change to correction data B' that is used when the extender group 105 is inserted and the distortion correction process is ineffective. Then, the process proceeds to step S910.

[0071] Note that instead of the correction data A' and B', difference data indicating the differences from the correction data A and B as basic correction data may be used, or the correction data B may also be difference data with respect to the correction data A as basic correction data.

[0072] In step S910, the lens arithmetic unit 120 reads any one of the correction data A, B, A', and B' set in steps S906 to S909 from the correction data storage unit 140.

[0073] In step S911, when the focus lens group 101 is driven, the lens arithmetic unit 120 calculates the driving amount of the zoom lens group 102 based on the position of the focus lens group 101 and the correction data read in step S910.

[0074] Next, in step S912, the lens arithmetic unit 120 drives the zoom lens group 102 according to the driving amount calculated in step S911. Thereby, the change in the focus angle of view is corrected.

[0075] In this embodiment, the correction data used for correcting the change in the focus angle of view is switched according to the presence or absence of the distortion correction process in the digital camera 200 and the insertion / non-insertion of the extender group 105. Thereby, the change in the focus angle of view can be corrected well regardless of the presence or absence of the distortion correction process and the insertion / non-insertion of the extender group 105.

Embodiment

[0076] Next, Example 6 will be described. FIG. 10 shows the configuration of an imaging system including an interchangeable lens 100 and a digital camera 200B. In this example, the digital camera 200B is different from Example 1 in that it has an angle-of-view correction unit 260 that corrects the focus angle-of-view change component in the image data by performing image processing on the image data (hereinafter referred to as image angle-of-view correction processing), and an imaging mode setting unit 270 that sets the imaging mode. The imaging mode setting unit 270 sets a moving image shooting mode or a still image shooting mode according to the user's operation on the digital camera 200B.

[0077] FIG. 11 shows the lens angle-of-view correction processing executed by the lens arithmetic unit 120 in this example. Step S1101 in FIG. 11 is the same as step S101 in FIG. 1.

[0078] In step S1102, the lens arithmetic unit 120 determines whether the imaging mode set in the digital camera 200B is the still image shooting mode (or the moving image shooting mode). If it is the still image shooting mode, this process ends. If it is the moving image shooting mode, the process proceeds to step S1103.

[0079] In step S1103, the lens arithmetic unit 120 determines whether the image angle-of-view correction processing in the digital camera 200B is effective (ON) or invalid (OFF). If it is effective, there is no need to correct the focus angle-of-view change in the interchangeable lens 100, so this process ends. On the other hand, if the image angle-of-view correction processing is invalid, the process proceeds to step S1104.

[0080] Steps S1104 to S1109 are the same as steps S103 to S108 in FIG. 1.

[0081] In this embodiment, the focus angle of view change in the interchangeable lens 100 is corrected only when the image angle of view correction process in the digital camera 200B is invalid. Then, the correction data used for correcting the focus angle of view change is switched according to whether the distortion correction process in the digital camera 200 is performed or not. Thereby, the focus angle of view change can be corrected well regardless of whether the distortion correction process is performed or not.

[0082] In addition, in each embodiment, it is preferable that the focus lens group 101 on the most object side of the zoom lens is stationary (fixed) during zooming. Thereby, even when the variable magnification lens group 102 is moved during zooming, the focus position does not change, and the roles of focusing and zooming can be set independently for the focus lens group 101 and the variable magnification lens group 102, respectively. For this reason, when correcting the focus angle of view change by driving the variable magnification lens group 102, the driving structure and control become simple.

[0083] Further, the lens angle of view correction process described in each embodiment is preferably particularly performed when the focus lens group on the most object side of the zoom lens has a positive refractive power and moves toward the object side during focusing from infinity to the closest distance. In such a type of zoom lens, the number of lenses constituting the focus lens group on the most object side can be reduced, which is advantageous for reducing the size and weight of the zoom lens. On the other hand, since the difference in height from the optical axis of the off-axis light beam passing through at least a part of the focus lens group between infinity and the closest distance is large, the variation in distortion aberration due to focusing becomes large. In contrast, by performing the lens angle of view correction process of each embodiment, the focus angle of view change can be effectively suppressed regardless of whether the distortion correction process is effective or not.

[0084] The above embodiments include the following configurations.

[0085] (Configuration 1) A lens device detachably attached to an imaging device, A zoom lens including a focus lens that moves for focusing and a variable magnification lens that moves for variable magnification, Processing means for performing lens angle-of-view correction processing for driving the variable magnification lens in order to reduce the change in the angle of view of the zoom lens accompanying the movement of the focus lens. The lens device is characterized in that the processing means changes the lens angle-of-view correction processing according to whether aberration correction processing for reducing the aberration of the zoom lens is performed on the image data in the imaging device. (Configuration 2) The lens device according to Configuration 1, wherein the aberration includes distortion aberration. (Configuration 3) The lens device according to Configuration 1 or 2, wherein the processing means acquires information on whether the aberration correction processing is performed from the imaging device, and changes the lens angle-of-view correction processing based on the information. (Configuration 4) The lens device has setting means for enabling the imaging device to set whether to perform the aberration correction processing. The lens device according to any one of Configurations 1 to 3, wherein the processing means changes the lens angle-of-view correction processing according to the setting. (Configuration 5) The lens device according to any one of Configurations 1 to 4, wherein the processing means changes the lens angle-of-view correction processing according to the imaging area in the imaging device. (Configuration 6) The zoom lens is capable of inserting and removing an optical unit for changing the focal length range of the zoom lens. The lens device according to any one of Configurations 1 to 5, wherein the processing means changes the lens angle-of-view correction processing according to the insertion and removal of the optical unit. (Configuration 7) The processing means Performs the lens angle-of-view correction processing using correction data for driving the variable magnification lens, The lens device according to any one of Configurations 1 to 6, wherein the correction data is changed according to whether the aberration correction processing is performed in the imaging device. (Configuration 8) The lens device according to configuration 7, characterized in that it has storage means for holding the correction data used when the aberration correction process is performed in the imaging device and the correction data used when the aberration correction process is not performed. (Configuration 9) The lens device according to configuration 7, characterized in that it has storage means for holding first data as the correction data used in one of the cases where the aberration correction process is performed and not performed in the imaging device, and second data for generating the correction data used in the other case by combining it with the first data. (Configuration 10) The lens device according to configuration 9, characterized in that the second data has a smaller data capacity than the first data. (Configuration 11) When the imaging device is capable of performing an image field angle correction process for correcting the change in the field angle with respect to image data, The lens device according to any one of configurations 1 to 10, characterized in that the processing means performs the lens field angle correction process only when the image field angle correction process is not performed in the imaging device. (Configuration 12) When the imaging device is capable of still image imaging and video imaging, The lens device according to any one of configurations 1 to 11, characterized in that the processing means performs the lens field angle correction process only when video imaging is performed with the imaging device. (Configuration 13) The zoom lens according to any one of configurations 1 to 12, characterized in that the focus lens is included in the lens group closest to the object side. (Configuration 14) The lens device according to configuration 13, characterized in that the lens group closest to the object side has a positive refractive power, and the focus lens moves toward the object side when focusing from infinity to the closest distance. (Configuration 15) An imaging apparatus, wherein a lens device according to any one of Configurations 1 to 14 is detachably attached, and it is possible to set whether the aberration correction process is effective or not.

[0086] (Other embodiments) The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and having one or more processors in a computer of the system or apparatus read and execute the program. Further, it can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

[0087] Each of the embodiments described above is merely a representative example, and various modifications and changes can be made to each embodiment when implementing the present invention.

Explanation of reference numerals

[0088] 100 Interchangeable lens (lens device) 101 Focus lens group 102 Zoom lens group 112 Setting unit 140 Correction data storage unit 200 Digital camera (imaging apparatus)

Claims

1. A lens device detachably attached to an imaging device, comprising: a zoom lens including a focus lens that moves for focusing and a zoom lens that moves for zooming; processing means for performing a lens angle-of-view correction process for driving the zoom lens to reduce a change in the angle of view of the zoom lens accompanying the movement of the focus lens; The processing means is characterized in that the lens angle-of-view correction process is changed according to whether or not an aberration correction process for reducing the aberration of the zoom lens is performed on image data in the imaging device.

2. The lens device according to claim 1, wherein the aberration includes distortion aberration.

3. The lens device according to claim 1, wherein the processing means acquires information on whether or not the aberration correction process is performed from the imaging device, and changes the lens angle-of-view correction process based on the information.

4. The lens device has setting means for enabling the imaging device to set whether or not to perform the aberration correction process, The processing means is characterized in that the lens angle-of-view correction process is changed according to the setting in claim 1.

5. The lens device according to claim 1, wherein the processing means changes the lens angle-of-view correction process according to an imaging area in the imaging device.

6. The zoom lens is capable of inserting and removing an optical unit for changing the focal length range of the zoom lens, The lens device according to claim 1, wherein the processing means changes the lens angle-of-view correction process according to the insertion and removal of the optical unit.

7. The processing means performs the lens angle-of-view correction process using correction data for driving the zoom lens, The lens device according to claim 1, wherein the correction data is changed according to whether or not the aberration correction process is performed in the imaging device.

8. The lens device according to claim 7, further comprising storage means for storing the correction data used when the aberration correction process is performed in the imaging device and the correction data used when the aberration correction process is not performed.

9. The lens device according to claim 7, characterized in that it has storage means for holding first data as the correction data used in one of the cases where the aberration correction process is performed and not performed in the imaging device, and second data for generating by combining the correction data used in the other case with the first data.

10. The lens device according to claim 9, characterized in that the second data has a smaller data capacity than the first data.

11. When the imaging device is capable of performing an image field angle correction process for correcting the field angle change with respect to image data, The lens device according to claim 1, characterized in that the processing means performs the lens field angle correction process only when the image field angle correction process is not performed in the imaging device.

12. When the imaging device is capable of still image shooting and moving image shooting, The lens device according to claim 1, characterized in that the processing means performs the lens field angle correction process only when moving image shooting is performed with the imaging device.

13. The lens device according to claim 1, characterized in that the zoom lens includes the focus lens in the lens group closest to the object side.

14. The lens device according to claim 13, characterized in that the lens group closest to the object side has a positive refractive power, and the focus lens moves toward the object side when focusing from infinity to the closest distance.

15. An imaging device, characterized in that the lens device according to any one of claims 1 to 14 is detachably mounted, and the setting of enabling and disabling the aberration correction process is possible.

16. A control method for a lens device having a zoom lens including a focus lens that moves for focusing and a zoom lens that moves for zooming, and being detachably mounted on an imaging device, comprising: Performing a lens field angle correction process for driving the zoom lens to reduce the field angle change of the zoom lens accompanying the movement of the focus lens; And a step of changing the lens field angle correction process according to whether or not an aberration correction process for reducing the aberration of the zoom lens with respect to image data is performed in the imaging device.

17. A program, characterized in that a process according to the control method described in claim 16 is executed by a computer of the lens device.

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