JP2026007796A - Lens device and imaging device - Google Patents

Abstract

An object of the present invention is to enable autofocusing using correction information that corresponds to various optical conditions.
An imaging device performs autofocus correction using correction information, which includes first information based on design values of the optical system, second information based on manufacturing errors of the optical system, third information indicating optical conditions that differ from the optical conditions set by the first information and the second information, and fourth information indicating a correction value corresponding to the third information.
[Selected Figure] Figure 1

Description

The present invention relates to a lens device and an imaging device that perform autofocus (AF).

In imaging devices capable of AF, correction information stored in the lens device is acquired and used to perform AF correction. However, even if AF correction is performed using the correction information, optimal correction may not always be achieved, depending on aging, the subject, and the user's intentions.

Patent document 1 discloses an imaging device that allows the user to change correction information or reset it to its initial value.

Japanese Patent Application Laid-Open No. 2001-174690

The imaging device in Patent Document 1 makes it possible to change correction information for optical conditions such as pre-fixed zoom position and subject distance, but it is not possible to prepare correction information for other optical conditions that the user desires.

One aspect of the present invention is a lens device that includes an optical system and a storage means for storing correction information used for autofocus correction. The correction information includes first information based on the design values of the optical system, second information based on manufacturing errors of the optical system, third information indicating optical conditions that differ from the optical conditions set by the first information and second information, and fourth information indicating a correction value corresponding to the third information.

Another aspect of the present invention is an imaging device that includes an image sensor that captures images via an optical system and a control means that controls autofocus. The control means performs autofocus correction using correction information. The correction information includes first information based on design values of the optical system, second information based on manufacturing errors of the optical system, third information that indicates optical conditions that differ from the optical conditions set by the first information and the second information, and fourth information that indicates a correction value corresponding to the third information.

According to the present invention, AF can be performed using correction information that corresponds to various optical conditions.

FIG. 1 is a block diagram showing the configuration of an imaging system according to an embodiment. 10 is a flowchart showing a focus adjustment process in the embodiment. FIG. 4 is a diagram showing an adjustment state in the first embodiment. FIG. 10 is a diagram showing an adjustment state in the second embodiment. FIG. 10 is a diagram showing an adjustment state in the third embodiment. FIG. 10 is a diagram showing an image capture screen before center adjustment in the embodiment. 10A and 10B are diagrams showing an image capture screen after center adjustment in the embodiment. FIG. 10 is a diagram showing an image capture screen before periphery adjustment in the embodiment. FIG. 10 is a diagram showing an image capture screen after periphery adjustment in the embodiment.

The following describes an embodiment of the present invention with reference to the drawings.

Figure 1 shows the configuration of an imaging system including the lens device of Example 1 and a camera as an imaging device to which the lens device is detachably attached. The lens device has an imaging optical system including a zoom lens 3 and a focus lens 4. A user can change the focal length by rotating the zoom ring 1 to move the zoom lens 3 in the optical axis direction. A user can also perform manual focusing by rotating the focus ring 2 to move the focus lens 4 in the optical axis direction. Furthermore, the focus lens 4 is driven in the optical axis direction by a focus drive unit 10 that includes an actuator. Note that the imaging optical system may also be a fixed-focus optical system that does not have a zoom lens.

The zoom position sensor 5 detects the position of the zoom lens 3 (hereinafter referred to as the zoom position), and the focus position sensor 6 detects the position of the focus lens 4 (hereinafter referred to as the focus position). The lens MPU 7 acquires the detected zoom position and focus position, and can control the drive of the focus lens 4 via the focus drive unit 10 in response to AF instructions from the camera. The lens MPU 7 has a memory (storage means) 8. The memory 8 stores (holds) correction information used to make corrections related to the autofocus of the imaging optical system. Details of the correction information will be described later.

The lens MPU 7 can send and receive data and commands to and from the camera (camera MPU 12) via the lens communication unit 9 and the camera's camera communication unit 16. Specifically, the lens MPU 7 sends information such as the zoom position and focus position, as well as the correction information described above, to the camera MPU 12. The camera MPU 12 also sends the AF instructions described above to the lens MPU 7.

The camera has an image sensor 15, such as a CCD sensor or CMOS sensor. The image sensor 15 photoelectrically converts (captures) the subject image, which is an optical image formed by the imaging optical system, to generate an image signal.

The camera MPU 12 performs various processes on the image signal from the image sensor 15 to generate image data. The camera has a display unit 17 composed of an LCD or the like. The display unit 17 displays image data and various information related to imaging. The display unit 17 also displays messages prompting the user to perform operations in the adjustment mode described below and other information.

The defocus detection unit 11 detects the defocus amount of the imaging optical system. Specifically, it acquires focus detection signals with different phase differences depending on the defocus amount from multiple focus detection pixels provided on the image sensor 15, and detects the defocus amount from the phase difference detection results. The camera MPU 12, which serves as control means, calculates the drive amount of the focus lens 4 required to achieve a focused state from the detected defocus amount (hereinafter referred to as the focus drive amount), and sends an AF command including this focus drive amount to the lens MPU 7. Upon receiving the AF command, the lens MPU 7 controls the focus drive unit 10 so that the focus lens 4 is driven by the focus drive amount included in the AF command. AF is thereby performed. Note that the defocus detection unit 11 may detect the defocus amount using a method other than the phase difference detection method described above.

When performing the above-described AF, the camera MPU 12, acting as a correction means, performs AF correction using the correction information received from the lens MPU 7. For example, if the correction information is information for correcting the defocus amount detected by the defocus detection unit 11, AF correction is performed to calculate the focus drive amount based on the defocus amount corrected using the correction information. Furthermore, if the correction information is information for correcting the calculated focus drive amount, AF correction is performed to generate an AF command including the focus drive amount corrected using the correction information.

By performing AF correction using the correction information, it is possible to eliminate defocus (out-of-focus) caused by error factors such as manufacturing errors in the lens device, detection errors in the defocus amount by the defocus detection unit 11, and driving errors in the focus lens 4 due to deterioration of the lens device over time, enabling highly accurate AF. Below, we will explain the case where the correction information is information for correcting the defocus amount detected by the defocus detection unit 11.

The camera MPU 12 has a memory 13. The memory 13 stores (holds) correction information, including adjustment information acquired on the camera side, as described below.

An input unit 14 is also connected to the camera MPU 12. The user can select an adjustment mode via the input unit 14. In adjustment mode, the user performs manual focusing by operating the focus ring 2 of the lens device to focus on the subject under optical conditions (zoom position, subject distance, aperture value, image height, etc.) selected by the user. Performing manual focusing changes the defocus amount detected by the defocus detection unit 11. This changed defocus amount becomes the focus adjustment value as a correction value corresponding to the optical conditions selected by the user. In this way, the focus adjustment value can be obtained (generated) in the camera. The optical conditions under which the focus adjustment value is obtained are included in the adjustment information and correction information described below as third information. In the following description, the optical conditions under which the focus adjustment value is obtained are referred to as adjustment conditions. The focus adjustment value is also included in the adjustment information and correction information as fourth information. The number of adjustment conditions (and their corresponding focus adjustment values) is variable as long as it is equal to or less than the upper limit number described below.

The flowchart in Figure 2 shows the focus adjustment process flow for obtaining adjustment conditions and corresponding focus adjustment values and storing them as adjustment information in memory 13.

In step S1, the camera MPU 12 determines whether the user has selected the adjustment mode via the input device 4. If the adjustment mode has been selected, the process proceeds to step S2; if the adjustment mode has not been selected, the process ends.

In step S2, the camera MPU 12 displays a message on the display unit 17 prompting the user to zoom the lens device to a desired zoom position. The user operates the zoom ring 1 to move the zoom lens 3 to the desired zoom position for which focus adjustment is desired. The camera MPU 12 also displays a message on the display unit 17 prompting the user to operate the focus of the lens device to focus at the desired subject distance. The user uses manual focus via operation of the focus ring 2 to move the focus lens 4 to a focus position that provides the optimal focus state for the desired subject distance for which focus adjustment is desired.

Then, the camera MPU 12 performs the process of step S3 in response to the user's input via the input unit 14 indicating that the zoom operation and manual focus operation have been completed.

In step S3, the camera MPU 12 determines whether the user has performed an operation to instruct capture, and if capture has been instructed, performs the processing of step S4.

In step S4, the camera MPU 12 performs an imaging operation and generates captured image data using the imaging signal from the image sensor 15. At this time, the camera MPU 12 acquires the current (imaging time) zoom position and focus position (subject distance) from the lens device. Then, these zoom position and focus position are stored as the adjustment conditions for the current focus adjustment.

Next, in step S5, the camera MPU 12 obtains the current defocus amount from the defocus detection unit 11.

Next, in step S6, the camera MPU 12 generates a focus adjustment value from the defocus amount acquired in step S5. Specifically, if the acquired defocus amount is 0, the focus adjustment value is also set to 0. In this case, the focus state that the user considers to be optimal is obtained by AF using the defocus amount detected by the defocus detection unit 11 as is. On the other hand, if the acquired defocus amount is not 0, the focus adjustment value is set to a value equivalent to that defocus amount. In this case, the defocus amount detected by the defocus detection unit 11 is corrected using the focus adjustment value, thereby obtaining the focus state that the user considers to be optimal.

In addition, the camera MPU 12 may set the defocus amount of image data selected by the user as optimal from image data obtained through multiple captures with different focus positions (focus states) in manual focus as the focus adjustment value.

The camera MPU 12 may also present the user with evaluation values related to focus, such as the sharpness of image data obtained through multiple captures using different manual focus positions. In this case, the user may select the image data with the highest evaluation value from among the multiple image data, and the camera MPU 12 may set the defocus amount of the selected image data as the focus adjustment value. This reduces the impact on the focus adjustment value when manual focus is inappropriate.

Furthermore, when multiple images are captured under the same adjustment conditions, the camera MPU 12 may update the previously set focus adjustment value with the focus adjustment value obtained for each capture. In this case, the camera MPU 12 may also generate the final focus adjustment value by combining (e.g. averaging) the past and most recent focus adjustment values.

Next, in step S7, the camera MPU 12 determines whether the number of adjustment conditions for which focus adjustment has been performed up to this point has reached a pre-set upper limit. If the upper limit has not been reached, the process proceeds to step S9; if the upper limit has been reached, the process proceeds to step S8. The upper limit is set taking into consideration factors such as the storage capacity of the memory 13 for adjustment information.

In step S8, the camera MPU 12 extracts two or more adjustment conditions that are close to each other from the multiple adjustment conditions already stored in memory 13, and the corresponding focus adjustment values. It then combines the extracted adjustment conditions and focus adjustment values to generate a single adjustment condition and its corresponding focus adjustment value, and replaces the extracted adjustment condition and focus adjustment value in memory 13 with the generated adjustment condition and focus adjustment value. This keeps the number of adjustment conditions (and focus adjustment values) stored in memory 13 below an upper limit.

The adjustment conditions and focus adjustment values may be integrated by averaging the adjustment conditions and adjustment values, respectively, or one of the adjustment conditions to be integrated (for example, the most recent) and its corresponding focus adjustment value may be used as the integrated adjustment condition and focus adjustment value.

Then, in step S9, the camera MPU 12 adds the adjustment conditions stored in step S4 to the adjustment information in memory 13.

Furthermore, in step S10, the camera MPU 12 adds the focus adjustment value generated in step S6 to the adjustment information in memory 13, correlating it with the adjustment condition added in step S9.

After this, unless the adjustment mode is canceled, the changed adjustment conditions will be acquired each time an image is captured, the corresponding focus adjustment values will be generated, and the results will be stored in memory 13.

Furthermore, when the user instructs via the input unit 14 to end the adjustment mode, the camera MPU 12 sends the latest adjustment information in memory 13 to the lens MPU 7. The lens MPU 7 adds the received latest adjustment information to the correction information in memory 8.

The next time a lens device with correction information to which the latest adjustment information has been added and stored in memory 8 is attached to a camera, the correction information is sent to the camera. This allows the camera MPU 12 to perform AF using the correction information including the latest adjustment information.

Figure 3 shows the configuration of correction information stored in memory 8 within the lens device. The correction information includes design value correction information (first information), manufacturing error correction information (second information), and adjustment information. The adjustment information includes the adjustment conditions (third information) described above and the corresponding focus adjustment values (fourth information). Figure 3 shows correction information for zoom position and focus position. For zoom position, the telephoto end is defined as 1 and the wide end is defined as 8, with discrete zoom positions from 1 to 8 defined as fixed zoom positions. For focus position, the infinity end (INF) is defined as 1 and the closest end (MOD) is defined as 8, with discrete focus positions from 1 to 8 defined as fixed zoom positions. Note that these definitions are merely examples, and other definitions may be used.

Design value correction information is information used to correct the defocus amount, obtained based on the design values of the imaging optical system, and is stored for each fixed zoom position and each fixed focus position (hereinafter collectively referred to as fixed conditions).

The manufacturing error correction information is information used to correct the defocus amount, obtained based on the measurement values of the manufacturing errors of the imaging optical system, and is stored for each of the eight fixed zoom positions and the eight fixed focus positions.

The adjustment information is information acquired in the camera's adjustment mode described above, and is information about zoom and focus positions that differ from the fixed conditions (i.e., user-defined adjustment conditions) and the corresponding focus adjustment values. Note that Figure 3 shows adjustment information for one zoom position and one focus position.

Conventionally, design value correction information and manufacturing error correction information have been used as correction information, and the defocus amount detected in AF has been corrected using the design value correction information and manufacturing error correction information, and the focus drive amount has been calculated from the corrected defocus amount. There are also cameras that allow the user to adjust correction information equivalent to the design value correction information or manufacturing error correction information.

In contrast, in this embodiment, in addition to the design value correction information and manufacturing error correction information, the focus adjustment value is also used to correct the defocus amount detected in AF. Furthermore, the focus adjustment value corresponds to adjustment conditions set by the user that differ from the fixed conditions set by the design value correction information and manufacturing error correction information. Therefore, according to this embodiment, even if the above-mentioned error factors occur, it is possible to obtain AF results with high accuracy or that are more in line with the user's preferences.

Table 1 shows an example of the adjustment information shown in Figure 3. In this adjustment information, the adjustment conditions are a zoom position of 3.72 and a focus position of 4.20. The focus adjustment value corresponding to this adjustment condition is 0.50 mm, which is the offset value for the defocus amount.

The focus adjustment value is not limited to this type of offset value, but may also be, for example, the coefficient of a function that indicates the offset value using the image height on the image plane (on the imaging surface of the image sensor 15) as a variable. In this case, the user can select the image height as an adjustment condition. In other words, it is possible to obtain a focus adjustment value for each image height selected by the user.

Table 2 shows the number of adjustment conditions in the adjustment information shown in Table 1. There is one zoom position and one focus position as adjustment conditions, so the number of adjustment conditions is 1.

Table 3 shows examples of zoom/focus positions A and B in Figure 3 and their corresponding focus adjustment values (offset values). Zoom/focus position A is the same zoom position as the adjustment condition, but the focus position is at the infinity end. Zoom/focus position B is the same focus position as the adjustment condition, but the zoom position is at the telephoto end. Neither zoom/focus position A nor B is selected as an adjustment condition, but the focus adjustment values for zoom/focus positions A and B can be obtained from the focus adjustment values stored as adjustment information.

In Table 3, at zoom/focus position A, it is assumed that there is little variation in the performance of the imaging optical system due to changes in focus position, and the defocus correction value is set to 0.50 mm, the same as the defocus correction value at the zoom position of the adjustment condition. At zoom/focus position B, it is assumed that there is a large variation in the performance of the imaging optical system due to changes in focus position. However, no focus adjustment value is set at the telephoto end. In this case, the focus adjustment value at zoom/focus position B is set to 0 (meaning no correction is possible). In this way, if no focus adjustment value is set at the minimum or maximum optical conditions, the focus adjustment value is set to 0.

As described above, the focus adjustment values for any zoom/focus positions A and B that are not included in the adjustment conditions can be obtained based on the focus adjustment values corresponding to the adjustment conditions.

Note that Table 3 is only an example, and the optimal focus adjustment value should be set according to the optical characteristics of the imaging optical system.

Figure 4 shows the configuration of correction information in Example 2. In this example, the correction information also includes design value correction information, manufacturing error correction information, and adjustment information. However, the adjustment information also includes four adjustment conditions and their corresponding focus adjustment values. One of the four adjustment conditions is the same as the adjustment condition in Example 1, and two of the other three adjustment conditions have zoom positions at the wide end and focus positions close to each other.

Table 4 shows an example of the adjustment information shown in Figure 4. In this adjustment information, the adjustment conditions are a zoom position of 3.72 and a focus position of 4.20, a zoom position of 1.00 and a focus position of 2.55, a zoom position of 8.00 and a focus position of 6.70, and a zoom position of 8.00 and a focus position of 6.50. The focus adjustment values (defocus amount offset values) corresponding to these four adjustment conditions are 0.50 mm, 0.20 mm, -0.30 mm, and -0.50 mm, respectively.

Table 5 shows the number of adjustment conditions for the adjustment information shown in Table 4. There are three zoom positions and four focus positions as adjustment conditions, and the total number of settable adjustment conditions is 12 (= 3 x 4).

Figure 5 shows the configuration of correction information in Example 3. In this example, the correction information also includes design value correction information, manufacturing error correction information, and adjustment information. This example shows an example in which, of the four adjustment conditions shown in Example 2 (Figure 4), two adjustment conditions in which the zoom position is at the wide end and the focus positions are close to each other, and their corresponding focus adjustment values, are combined into one adjustment condition and its corresponding focus adjustment value. Here, the two adjustment conditions and their focus adjustment values are combined by taking the average.

Table 6 shows an example of the adjustment information shown in Figure 5. Here, of the adjustment conditions shown in Table 4 in Example 2, the adjustment condition with a zoom position of 8.00 and a focus position of 6.70 and the adjustment condition with a zoom position of 8.00 and a focus position of 6.50 are combined into one. Accordingly, the corresponding focus adjustment values of -0.03 mm and -0.05 mm are averaged and combined into a single focus adjustment value.

Table 7 shows the number of adjustment conditions in the adjustment information shown in Table 6. There are three zoom positions and three focus positions as adjustment conditions, and the number of settable adjustment conditions is 9 (= 3 x 3). Compared to Example 2, the number of settable adjustment conditions has been reduced by integrating the adjustment conditions, and as a result, the data capacity of the correction information can be reduced.

Table 8 shows an example of zoom/focus position C in Figure 5 and its corresponding focus adjustment value (offset value). Although zoom/focus position C is not selected as an adjustment condition, the focus adjustment value for zoom/focus position C can be obtained from the focus adjustment value stored as adjustment information. Specifically, the focus adjustment value for zoom/focus position C is obtained by interpolation or other processing from the focus adjustment values at the zoom/focus positions selected as the two adjustment conditions that are as close as possible to zoom/focus position C. Here, two zoom/focus positions, 3.72 and 8.00, are used.

The focus position of zoom/focus position C is the same as the focus position of one of the two zoom/focus positions (the one with a zoom position of 3.72), so the focus adjustment value of that other zoom/focus position is used as is. Furthermore, because the zoom position of zoom/focus position C is different from the zoom positions of the other two zoom/focus positions, a focus adjustment value is calculated based on the ratio between these zoom positions and the zoom position of zoom/focus position C. As a result, a focus adjustment value of 0.05 mm is calculated.

In this way, the focus adjustment value for any zoom/focus position C that is not included in the adjustment conditions can be obtained based on the focus adjustment value corresponding to the adjustment conditions.

Figure 6 shows the display on the display unit 17 in adjustment mode. An AF frame 1 indicating the area where AF is performed is displayed in the center of the display screen, and a defocused subject image 2 is displayed within this AF frame 1. Figure 7 shows the subject image 2 that has been brought into focus by the user using manual focus from the defocused state of Figure 6. The amount of defocus change from the defocused state of Figure 6 to the focused state of Figure 7 is the focus adjustment value.

Figure 8 also shows the display on the display unit 17 in adjustment mode. An AF frame 1 is displayed in the lower right corner of the display screen, and a defocused subject image 2 is displayed within this AF frame 1. Figure 9 shows the subject image 2 that has been brought into focus by the user using manual focus from the defocused state of Figure 8. The amount of defocus change from the defocused state of Figure 8 to the focused state of Figure 9 is the focus adjustment value.

In this way, in this embodiment, image height can also be selected as one of the adjustment conditions. By using the focus adjustment value for each image height as a coefficient of a function that uses image height as a variable, as described above, the amount of data that is stored can be reduced compared to when the defocus amount for each image height is stored as the focus adjustment value.

In the above embodiments, the adjustment conditions are described as being selected by the user, but the camera (camera MPU 12) may also select them automatically. For example, the camera may store information on zoom positions and focus positions that are often selected by users when actually capturing images, and the camera may select adjustment conditions that differ from the fixed conditions within the range of those zoom positions and focus positions.

The above embodiment includes the following configurations:

(Configuration 1)
An optical system;
a storage means for storing correction information used for correction relating to autofocus;
The correction information is
First information based on design values of the optical system;
Second information based on manufacturing errors of the optical system;
third information indicating optical conditions different from the optical conditions set in the first information and the second information;
and fourth information indicating a correction value corresponding to the third information.
(Configuration 2)
2. The lens device according to configuration 1, wherein the number of the third information and the fourth information is variable.
(Configuration 3)
the first information and the second information are provided for fixed optical conditions,
3. The lens device according to claim 1, wherein the third information indicates an optical condition selected by a user.
(Configuration 4)
4. The lens apparatus according to any one of configurations 1 to 3, wherein the optical conditions include at least one of a zoom position of the optical system, a subject distance, an aperture value, and an image height.
(Configuration 5)
5. The lens device according to any one of configurations 1 to 4, wherein the fourth information is used to correct a defocus amount detected in the autofocus.
(Configuration 6)
6. The lens device according to any one of configurations 1 to 5, wherein the fourth information is a coefficient of a function that indicates the correction value with the image height as a variable.
(Configuration 7)
7. The lens device according to any one of configurations 1 to 6, wherein the first, second, third, and fourth information is output to an imaging device to which the lens device is attached.
(Configuration 8)
an imaging element that captures an image via an optical system;
and a control means for controlling autofocus,
the control means performs correction related to the autofocus using the correction information;
The correction information is
First information based on design values of the optical system;
Second information based on manufacturing errors of the optical system;
third information indicating optical conditions different from the optical conditions set in the first information and the second information;
and fourth information indicating a correction value corresponding to the third information.
(Configuration 9)
9. The imaging device according to configuration 8, wherein the number of the third information and the fourth information is variable.
(Configuration 10)
the first information and the second information are provided for fixed optical conditions,
10. The imaging device according to configuration 8 or 9, wherein the third information indicates optical conditions selected by a user.
(Configuration 11)
11. The imaging apparatus according to any one of configurations 8 to 10, wherein the optical conditions include at least one of a zoom position of the optical system, a subject distance, an aperture value, and an image height.
(Configuration 12)
12. The imaging device according to any one of configurations 8 to 11, wherein the fourth information is used to correct a defocus amount detected in the autofocus.
(Configuration 13)
13. The imaging apparatus according to any one of configurations 8 to 12, wherein the fourth information is a coefficient of a function that indicates the correction value with the image height as a variable.
(Configuration 14)
14. The imaging device according to any one of configurations 8 to 13, further comprising a generating unit for generating the third information and the fourth information.
(Configuration 15)
further comprising a detection means for detecting a defocus amount;
15. The imaging apparatus according to configuration 14, wherein the generating means generates the fourth information using the defocus amount obtained by the detecting means when a user performs manual focusing.
(Configuration 16)
The imaging device described in configuration 14, characterized in that the generation means generates the fourth information using the defocus amount of an image selected by a user from a plurality of images obtained by capturing images multiple times in which the focus states by the manual focus are different from each other.
(Configuration 17)
The imaging device described in configuration 14, wherein the generation means presents to a user evaluation values regarding focus of multiple images obtained by capturing images multiple times in which the focus states by the manual focus are different from each other, and generates the fourth information using the defocus amount of an image selected by the user.
(Configuration 18)
The imaging device described in any one of configurations 14 to 17, characterized in that the generation means integrates multiple pieces of third information and the corresponding fourth information into one piece of third information and the corresponding fourth information.
(Configuration 19)
19. The imaging device according to any one of configurations 14 to 18, wherein the generation means uses the third information and the corresponding fourth information to generate the correction value corresponding to an optical condition different from the optical condition indicated by the third information.

(Other Examples)
The present invention can also be realized by supplying a program that realizes one or more of the functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program.The present invention can also be realized by a circuit (e.g., an ASIC) that realizes one or more of the functions.

The embodiments described above are merely representative examples, and various modifications and variations are possible when implementing the present invention.

4 Focus lens 8 Memory 11 Defocus detection unit 12 Camera MPU

Claims (20)

An optical system,
a storage means for storing correction information used for correction relating to autofocus;
The correction information is
First information based on design values of the optical system;
Second information based on manufacturing errors of the optical system;
third information indicating optical conditions different from the optical conditions set in the first information and the second information;
and fourth information indicating a correction value corresponding to the third information. The lens device described in claim 1, characterized in that the number of the third information and the fourth information is variable. the first information and the second information are provided for fixed optical conditions,
The lens device according to claim 1 , wherein the third information indicates an optical condition selected by a user. The lens device according to claim 1, wherein the optical conditions include at least one of the zoom position of the optical system, subject distance, aperture value, and image height. The lens device according to claim 1, wherein the fourth information is used to correct the amount of defocus detected during autofocus. The lens device according to claim 1, wherein the fourth information is a coefficient of a function that indicates the correction value using image height as a variable. The lens device described in claim 1, characterized in that the first, second, third, and fourth information are output to an imaging device to which the lens device is attached. an imaging element that captures an image via an optical system;
and a control means for controlling autofocus,
the control means performs correction related to the autofocus using the correction information;
The correction information is
First information based on design values of the optical system;
Second information based on manufacturing errors of the optical system;
third information indicating optical conditions different from the optical conditions set in the first information and the second information;
and fourth information indicating a correction value corresponding to the third information. The imaging device described in claim 8, characterized in that the number of the third information and the fourth information is variable. the first information and the second information are provided for fixed optical conditions,
9. The imaging apparatus according to claim 8, wherein the third information indicates optical conditions selected by a user. The imaging device of claim 8, wherein the optical conditions include at least one of the zoom position of the optical system, subject distance, aperture value, and image height. The imaging device described in claim 8, characterized in that the fourth information is used to correct the amount of defocus detected during the autofocus. The imaging device described in claim 8, wherein the fourth information is a coefficient of a function that indicates the correction value using image height as a variable. The imaging device described in claim 8, further comprising a generating means for generating the third information and the fourth information. further comprising a detection means for detecting a defocus amount;
15. The imaging apparatus according to claim 14, wherein the generating means generates the fourth information using the defocus amount obtained by the detecting means when a user performs manual focusing. The imaging device described in claim 14, characterized in that the generation means generates the fourth information using the defocus amount of an image selected by the user from multiple images obtained by multiple captures in which the focus states using the manual focus are different from each other. The imaging device described in claim 14, characterized in that the generation means presents to the user evaluation values related to focus of multiple images obtained by capturing images multiple times with different focus states using the manual focus, and generates the fourth information using the defocus amount of an image selected by the user. The imaging device described in claim 14, characterized in that the generation means integrates multiple pieces of third information and their corresponding fourth information into one piece of third information and its corresponding fourth information. The imaging device described in claim 14, characterized in that the generation means uses the third information and the corresponding fourth information to generate the correction value corresponding to optical conditions different from the optical conditions indicated by the third information. A control method for an imaging device capable of capturing images via an optical system, comprising:
performing correction related to autofocus using the correction information;
The correction information is
First information based on design values of the optical system;
Second information based on manufacturing errors of the optical system;
third information indicating optical conditions different from the optical conditions set in the first information and the second information;
and fourth information indicating a correction value corresponding to the third information.