JP4412746B2 - Electronic still camera - Google Patents

Description

次に、動画モニタ時にＡＥシーケンスについて説明する。
【００２５】
図５のタイミングチャートにおいて、VDは垂直同期信号、FLD は奇数フィールドと偶数フィールドを示す信号、Cam-idは、マイコンプログラム内で同期をとるためのカンウタ値であり、０〜３までを繰り返しカウントする。
Cam-idが０、１の時には、積算１、２を実行する。積算１、２は、それぞれ輝度信号の１フィールド分の積算等によって現在の露出量を求めるとともに、ＣＣＤの基準露出量からのずれ量を求め、このずれ量を修正すべくシャッタ速度を求める露出計算を行う。Cam-idが２の時に上記のようにして求めたシャッタ速度によって露出制御する。尚、絞り装置は、前述したように開放絞り（Ａｖ値＝２．５）で固定である。
【００２６】
そして、Cam-idのカウント値（０〜３）に応じて上記動作を繰り返し実行する。従って、動画の絞り制御は、４フィールド毎に繰り返し行われる。
次に、静止画記録（動画モニターＯＦＦ）時のＡＥシーケンスについて説明する。
図６のタイミングチャートに示すように、スイッチＳ１がＯＮされると、撮像回路系に電源が供給される。続いて、上記と同様にCam-idのカウント値（０〜３）に応じて露出制御するが、まず、図７に示すように開放絞りとし、シャッタ速度を1/250sec（Ｔｖ＝８）にして輝度信号を取り込み、現在の露出量を求め、ＣＣＤの基準露出量からのずれ量を求める。そして、ずれ量が、±２Ｅｖの範囲の場合には、絞りを切り替えずに、露出オーバー又はアンダーに応じてシャッタ速度を制御する。次に、このようにして露出制御した状態で、再び輝度信号を取り込み、現在の露出量とＣＣＤの基準露出量とのずれ量を求め、そのずれ量に応じてシャッタ速度を制御する。この再測光を３回繰り返し、ＡＥロックする。
【００２７】
一方、初期測定した露出量が基準露出量よりも２Ｅｖ以上大きい場合には、絞りを小絞り（Ａｖ＝５．５）に切り替え、再びシャッタ速度を1/250sec（Ｔｖ＝８）にして輝度信号を取り込み、その露出量と基準露出量とのずれ量を求める。そして、上記と同様に再測光を繰り返したのち、ＡＥロックする。また、初期測定した露出量が基準露出量よりも２Ｅｖ以上小さい場合には、シャッタ速度を1/60sec （Ｔｖ＝６）よりも遅くして輝度信号を取り込み、その露出量と基準露出量とのずれ量を求める。そして、上記と同様に再測光を繰り返したのち、ＡＥロックする。
【００２８】
上記のようにスイッチＳ１のＯＮによってＡＥロックされたのち、スイッチＳ２がＯＮされると、Cam-idのカウント値が０又は２のときのそのスイッチＳ２のトガー信号が受入され、６フィールド後に録画用の露光がなされ、８フィールド後に録画用の読み出しが行われる。
尚、この実施の形態の絞り装置は、開放絞りと小絞りの２段階に絞りを切り換えるものであるが、これに限らず、３段階以上に絞りを切り替えるものや、絞り径を連続的に変化させる虹彩絞りでもよい。
【００２９】
【発明の効果】
以上説明したように本発明によれば、モニタで動画の被写体像を表示する際には、絞りを固定するようにしたため、絞りの切替えによる不自然な輝度変化がなく、絞り装置が停止しているため消費電力を抑えることができる。一方、レリーズボタンが操作されると、絞り手段を適正絞り値に制御するとともに電子シャッタを制御するようにしたため、スミアなどのない良好な画像を記録することができる。
【図面の簡単な説明】
【図１】図１は本発明に係る電子スチルカメラの実施の形態を示す斜視図である。
【図２】図２は図１に示した電子スチルカメラの内部構造を示すブロック図である。
【図３】図３は測光エリアを示す図である。
【図４】図４は本発明に係る露出制御方法を示すＡＥプログラム線図である。
【図５】図５は動画モニタ時のＡＥシーケンスを示すタイミングチャートである。
【図６】図６は静止画記録時のＡＥシーケンスを示すタイミングチャートである。
【図７】図７は静止画記録時の開放絞り及び小絞りの初期測定領域を示す図である。
【符号の説明】
１４…メモリカード（スマートメディア）
１６…レリーズボタン
２４…パワースイッチ
２８…液晶モニタ
３２…撮影レンズ
３４…光学ビューファインダ
４２…固体撮像素子（ＣＣＤ）
５２…デジタル信号処理回路
５３…圧縮／伸長回路
５４…フレームメモリ
５６…マイコン
５８…ＡＦ評価回路
６１…ＡＦ駆動回路
７０…記録メディア／ＬＣＤ制御部
７４…ＬＣＤ駆動回路
８０…スロトボ装置
８５…スイッチ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic still camera, and more particularly to an electronic still camera having an optical viewfinder and a monitor capable of displaying a subject image based on an image signal obtained via an image pickup means.
[0002]
[Prior art]
Some conventional electronic still cameras include an optical viewfinder or an electronic viewfinder (LCD, EVF) or both as means for viewing a subject.
For cameras that shoot with the optical viewfinder, to reduce power consumption, the imaging circuit system power is turned on when the release button is half-pressed, photometry is started, AE is locked, and recording is performed when the release button is fully pressed. Control is well done. At this time, an iris and an electronic shutter for controlling the charge accumulation time in the image sensor are used as the exposure control means. Among these, the iris has a plurality of aperture holes in consideration of the control speed and accuracy. A diaphragm plate is often used.
[0003]
[Problems to be solved by the invention]
Cameras that observe the subject with an electronic viewfinder such as an LCD need to display moving images electronically. Therefore, using the diaphragm, unnatural changes can be seen when the aperture is switched. There is a problem in that power consumption increases because the diaphragm plate is driven following the change in luminance.
[0004]
On the other hand, if the aperture value is fixed and the entire exposure area is covered only by the electronic shutter, there is a problem that a phenomenon that adversely affects the image quality such as smear can be seen during still image recording.
On the other hand, when an iris diaphragm that continuously changes the aperture hole is used, there is a problem in terms of control speed, exposure accuracy, and reproducibility when a sequence is taken in which only the optical viewfinder is used.
[0005]
The present invention has been made in view of such circumstances, and there is no unnatural luminance change due to switching of the aperture when the subject is monitored with a moving image, and the power consumption is suppressed as much as possible. An object of the present invention is to provide an electronic still camera capable of recording a good image without any other image.
[0006]
In order to achieve the above object, the invention according to claim 1 of the present application includes a diaphragm unit that adjusts the amount of light incident on the image sensor through a photographing lens, an electronic shutter that controls a charge accumulation time in the image sensor, Photometric means for measuring the amount of light incident on the image sensor, a monitor capable of displaying a subject image based on an image signal obtained via the image sensor, a monitor display switch for turning the monitor ON / OFF, and the monitor An optical viewfinder that allows the subject to be viewed even when OFF, a strobe light emitting means that emits strobe light, and an exposure control means that controls the aperture means and the electronic shutter based on a photometric value measured by the photometric means, When the monitor is turned on to display a moving image subject image and the release button is not operated, the aperture means is preset. When the release button is operated, the aperture means is controlled to an appropriate aperture value and the electronic shutter is controlled to perform exposure control. An exposure control unit that controls the aperture unit to an open aperture when the strobe light unit emits strobe light; and a unit that selects a macro mode . When the macro mode is selected, the monitor is turned on. It is characterized by.
That is, when displaying a moving subject image on a monitor, the aperture is fixed, so that there is no unnatural brightness change due to aperture switching, and power consumption is reduced, and when the release button is operated, The aperture means is controlled to an appropriate aperture value and the electronic shutter is controlled so that a good image free from smear can be recorded.
Also, by providing an optical viewfinder that allows the subject to be seen even when the monitor is off, it is possible to shoot even when the monitor is off, reducing power consumption, and when the macro mode is selected, By turning on, it is possible to avoid the influence of parallax caused by using the optical viewfinder during macro photography.
The invention according to claim 2 of the present application is a diaphragm means for adjusting the amount of light incident on the image sensor through the photographing lens, an electronic shutter for controlling the charge accumulation time in the image sensor, and the amount of light incident on the image sensor. Photometric means, a monitor capable of displaying a subject image based on an image signal obtained through the image sensor, a strobe light emitting means for emitting strobe light, and the photometric value measured by the photometric means. Exposure control means for controlling an aperture means and an electronic shutter, wherein the monitor is turned on to display a moving subject image, and when the release button is not operated, the aperture means is fixed at a preset aperture value. And controlling only the electronic shutter to control exposure, and when the release button is operated, the aperture means is controlled to an appropriate aperture value. Exposure control means for controlling the electronic shutter to control exposure, and when the strobe light emitting means emits strobe light, the exposure control means for controlling the aperture means to an open aperture, and means for selecting a macro mode, and the exposure control The means is characterized in that when the macro mode is selected and the strobe light is emitted by the strobe light emitting means, the aperture means is controlled to a small aperture.
[0007]
Further, as shown in claim 3 of the present application, by using a diaphragm means that adjusts the amount of light incident on the image sensor stepwise by positioning a diaphragm hole formed in the diaphragm plate on the optical axis, Good exposure control is possible in terms of speed, exposure accuracy, and reproducibility.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an electronic still camera according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing an embodiment of an electronic still camera according to the present invention.
As shown in the figure, the front cabinet 10 and the rear cabinet 12 of this electronic still camera are formed so that the lens / finder unit can be accommodated on the right side in FIG. 1, and the left side of the front cabinet 10 and the rear cabinet 12 is formed. The part is formed with a grip part, and a memory card (smart media) 14 is detachable.
[0009]
The front cabinet 10 is provided with a release button 16, a finder window 18, a dimming sensor / self LED window 20, a strobe cover 22, and the like. The rear cabinet 12 has a power switch 24, a mode dial 26, and a liquid crystal monitor. 28 etc. are arranged. Reference numeral 29 denotes a jack cover.
FIG. 2 is a block diagram showing the internal structure of the electronic still camera.
[0010]
This electronic still camera includes a lens / finder unit 30, a CCD imaging unit 40, a main processing unit 50, a recording media / LCD control unit 70, a slot device 80, a switch unit 85, a jack unit 90, and a power supply unit 97. Yes.
The lens / finder unit 30 includes a photographing lens 32, an optical viewfinder 34, an aperture device (not shown), and driving means for these. The photographing lens 32 and the optical viewfinder 34 are simultaneously switched between tele / wide by the driving force from one zoom motor, and the diaphragm device moves the diaphragm plate in which the diaphragm hole is formed. As a result, the aperture can be switched in two stages, that is, an open aperture (F2.4) and a small aperture (F6.7). Further, the focus lens of the photographic lens 32 can be moved by the focus motor.
[0011]
The CCD image pickup section 40 includes a solid-state image pickup device (CCD) 42 and a CCD drive circuit 44, and subject light imaged on the light receiving surface of the CCD 42 via the photographing lens 32 and the diaphragm device is transmitted by each sensor. The signal charge is converted into an amount corresponding to the amount of incident light. The signal charges accumulated in this way are read out to the shift register by a read gate pulse applied from the CCD drive circuit 44, and sequentially read out as a voltage signal (image signal) corresponding to the signal charge by a register transfer pulse. The CCD 42 is provided with a shutter drain via a shutter gate, and the accumulated signal charge can be swept out to the shutter drain by driving the shutter gate with a shutter gate pulse. That is, the CCD 42 has a so-called electronic shutter function for controlling the accumulation time (shutter speed) of charges accumulated in each sensor by the shutter gate pulse. Further, the CCD drive circuit 44 outputs various pulse signals to the CCD 42 based on a synchronization signal added from the timing signal generation circuit 55 and a signal related to the electronic shutter control value.
[0012]
The main processing unit 50 mainly includes a CDS circuit 51, a digital signal processing circuit 52, a compression / decompression circuit 53, a frame memory 54, a timing signal generation circuit 55, a microcomputer 56, and the like. The CDS circuit 51 includes a CDS clamp 51A, a gain control amplifier 51B, and an A / D converter 51C. An image signal read from the CCD 42 is sampled and held for each pixel by the CDS clamp 51A, and a gain control amplifier. After being amplified by 51B, it is converted to R, G, B dot-sequential digital signals by the A / D converter 51C and applied to the digital signal processing circuit 52. The gain of the gain control amplifier 51B is controlled by an electronic volume (not shown).
[0013]
The digital signal processing circuit 52 is a multiplication circuit that independently multiplies the R, G, and B signals by an amplification control value, a circuit that obtains a color integration value by integrating the R, G, and B signals for each color, R, G A circuit for generating color difference signals BY, RY, luminance signal Y from the B signal, a photometric circuit for integrating the luminance signal Y for one screen, and obtaining the integrated value (photometric value), etc. Amplification control values for the R and B signals are determined based on the integrated color value, thereby performing white balance control. Note that the photometry circuit in the digital signal processing circuit 52 integrates the luminance signal Y for each of a plurality of blocks on one screen as shown in FIG. Each area A0 to A4 shown in (B) is weighted and integrated, whereby a photometric value of center-weighted photometry is obtained.
[0014]
Further, the digital signal processing circuit 52 exchanges the luminance signal Y and the chroma signal C with the compression / decompression circuit 53, and sends the color difference signals BY, RY, and the luminance signal Y to the D / A converter 57. The luminance signal Y is output to the AF evaluation circuit 58 for autofocus (AF), and the photometric value is output to the microcomputer 56.
The compression / decompression circuit 53 includes a memory controller for the frame memory 54, compresses the luminance signal Y and chroma signal C for one frame stored in the frame memory 54 in a predetermined format, and stores the compressed image data in a recording medium. The data is output to the recording media controller 72 of the LCD controller 70, and the compressed image data from the recording media controller 72 is decompressed and stored in the frame memory 54.
[0015]
The AF evaluation circuit 58 includes a high-pass filter that extracts high-frequency components of the luminance signal Y and an integration counter that integrates the extracted high-frequency components for one screen. The high-frequency integrated value integrated by the integration counter is used as an AF evaluation value. To the microcomputer 56.
The microcomputer 56 comprehensively controls each circuit based on the switch operation of the switch unit 85, determines the aperture value of the aperture device and the electronic shutter control value of the CCD 40 based on the photometric value, and determines the aperture / zoom drive circuit 60. And the shutter gate pulse is applied to the CCD 42 via the timing signal generation circuit 55 and the CCD drive circuit 44 based on the electronic shutter control value to control the charge accumulation time in the CCD 42. Further, the microcomputer 56 performs focusing by moving the focus lens via the AF driving circuit 61 so that the AF evaluation value becomes maximum based on the AF evaluation value applied from the AF evaluation circuit 58. When the focus lens is at the in-focus position, the high frequency component in the image signal is the largest, so the AF evaluation value is maximized.
[0016]
On the other hand, the color difference signals BY, RY, and luminance signal Y converted from the digital signal processing circuit 52 to the analog signal via the D / A converter 57 are added to the mix circuit 63 via the low-pass filter 62. Appropriate character information or the like is added to the other input of the mix circuit 63 from the character generator 64, and the mix circuit 63 mixes these signals to encode the encoder 65 and the recording medium / LCD control unit 70. Is output to the LCD drive circuit 74.
[0017]
The encoder 65 generates, for example, an NTSC color composite video signal based on the input color difference signals BY, RY, and the luminance signal Y, and outputs this to the video output terminal 96 of the jack section 90. The LCD drive circuit 74 drives the liquid crystal monitor 28 based on the input color difference signals BY, RY, and the luminance signal Y, and displays an image on the monitor screen.
[0018]
The recording medium controller 72 of the recording medium / LCD control unit 70 records the image data compressed by the compression / decompression circuit 53 on the memory card 14 attached to the socket 76, and the image recorded on the memory card 14. Data is read and output to the compression / decompression circuit 53.
The slot device 80 is, for example, an auto strobe device capable of low-luminance automatic light emission, and mainly includes a strobe control circuit 81, a capacitor 82, a discharge tube 83, and a light control sensor. When the subject brightness is equal to or lower than the predetermined brightness, the strobe control circuit 81 outputs a trigger signal to cause the discharge tube 83 to emit strobe light during exposure, and supplies the electric energy stored in the capacitor 82 to the discharge tube 83. To do. Further, when the amount of light received by the light control sensor 84 that receives the reflected light from the subject reaches a predetermined amount, the strobe control circuit 81 cuts off the electric energy to the discharge tube 83 and stops the strobe light emission. The strobe device 80 can emit light not only when the luminance is low but also when the forced light emission button is turned on.
[0019]
In addition to the release button 16, power switch 24, and mode dial 26 described above, the switch unit 85 includes a tele / wide zoom switch 86, a +/- key, an execution key 87, a monitor display switch 88, and a macro mode button (not shown). Etc. are provided. The release button 16 includes a switch S1 that is turned on when the release button 16 is half-pressed and a switch S2 that is turned on when the release button 16 is fully pressed. The mode dial 26 can select shooting, reproduction, erasure, self-timer, and the like, and the mode dial 26 may be used to select a macro mode. Further, the monitor display switch 88 is a switch for turning on / off the liquid crystal monitor 28.
[0020]
The jack section 90 is provided with a buzzer 91 that generates a shutter sound and a warning sound, an RS232C interface 92 and its serial terminal 93, a capacitor 94 for date backup, a power input terminal 95 for an AC adapter, and a video output terminal 96. ing.
The power supply unit 97 includes a DC / DC converter, and is supplied with power from the power input terminal 95 of the jack unit 90 or the battery 98, and supplies power of an appropriate voltage to each circuit in the camera.
[0021]
Next, exposure control of the electronic still camera according to the present invention will be described.
First, when the power switch 24 is turned on, power is supplied to each circuit, and the camera can be operated. However, when the power switch 24 is turned on, power is not immediately supplied to the imaging circuit system, which causes consumption. Power is suppressed. The power is supplied to the imaging circuit system when the release button 16 is operated, when the monitor display switch 88 is turned on, and when the macro mode button is turned on. The monitor display switch 88 or the macro is turned on. When the mode button is turned on, the liquid crystal monitor 28 is turned on and a subject image (moving image) is displayed. The reason why the liquid crystal monitor 28 is turned on when the macro mode button is turned on is to prevent the liquid crystal monitor 28 from being affected by the parallax caused by using the optical viewfinder 34 during macro photography.
[0022]
FIG. 4 is an AE program diagram showing an exposure control method according to the present invention.
As shown in the figure, when the liquid crystal monitor 28 is ON (moving image display), the aperture device is fixed at the open aperture (F2.4), and only the shutter speed (charge accumulation time) by the electronic shutter is controlled. In other words, even if the Ev value exceeds 11.5, it is fixed at the open stop (F2.4) (Av value = 2.5) as shown by the dotted line. Thereby, there is no unnatural change in the moving image generated when the aperture is switched, and the power consumption for the aperture device can be suppressed.
[0023]
On the other hand, when the release button 16 is operated, the diaphragm device is also controlled. That is, as shown by the solid line in FIG. 4, when the Ev value is 11.5 or less, the aperture device is switched to the full aperture (F2.4) (Av value = 2.5), and the Ev value is 11. When 5 is exceeded, it is switched to the small aperture (F6.7) (Av = 5.5).
In addition, at the time of strobe light emission (including forced light emission), it is always switched to the open aperture side. However, always switch to the small aperture side during macro flash. Further, the operation of the release button 16 and the timing of AF and AE control are as shown in the following table, but not limited to this, any of the switches S1 and S2 may be turned on.
[0024]
[Table 1]

Next, the AE sequence will be described when monitoring a moving image.
[0025]
In the timing chart of FIG. 5, VD is a vertical synchronization signal, FLD is a signal indicating an odd field and an even field, Cam-id is a counter value for synchronization in the microcomputer program, and is repeatedly counted from 0 to 3. To do.
When Cam-id is 0 or 1, accumulation 1 and 2 are executed. Accumulation 1 and 2 respectively calculate the current exposure amount by integrating one field of the luminance signal, etc., determine the deviation amount from the reference exposure amount of the CCD, and calculate the shutter speed to correct the deviation amount. I do. When Cam-id is 2, exposure control is performed according to the shutter speed obtained as described above. The diaphragm device is fixed at the open diaphragm (Av value = 2.5) as described above.
[0026]
Then, the above operation is repeatedly executed according to the Cam-id count value (0 to 3). Accordingly, the moving picture aperture control is repeated every four fields.
Next, an AE sequence at the time of still image recording (moving image monitor OFF) will be described.
As shown in the timing chart of FIG. 6, when the switch S1 is turned on, power is supplied to the imaging circuit system. Subsequently, the exposure is controlled in accordance with the Cam-id count value (0 to 3) in the same manner as described above. First, as shown in FIG. 7, the aperture is opened and the shutter speed is set to 1/250 sec (Tv = 8). Then, the luminance signal is acquired, the current exposure amount is obtained, and the deviation amount from the reference exposure amount of the CCD is obtained. When the deviation amount is in the range of ± 2 Ev, the shutter speed is controlled according to overexposure or underexposure without switching the aperture. Next, with the exposure controlled as described above, a luminance signal is taken in again to obtain a deviation amount between the current exposure amount and the reference exposure amount of the CCD, and the shutter speed is controlled in accordance with the deviation amount. This re-photometry is repeated three times to lock the AE.
[0027]
On the other hand, when the initially measured exposure amount is 2 Ev or more larger than the reference exposure amount, the aperture is switched to the small aperture (Av = 5.5), and the shutter speed is set to 1/250 sec (Tv = 8) again to obtain the luminance signal. And the amount of deviation between the exposure amount and the reference exposure amount is obtained. Then, after repeating the photometry in the same manner as described above, the AE lock is performed. When the initially measured exposure amount is 2 Ev or more smaller than the reference exposure amount, the shutter speed is made slower than 1/60 sec (Tv = 6) and a luminance signal is taken in. The exposure amount and the reference exposure amount Find the amount of deviation. Then, after repeating the photometry in the same manner as described above, the AE lock is performed.
[0028]
When the switch S2 is turned on after the AE is locked by turning on the switch S1 as described above, the toggle signal of the switch S2 when the count value of Cam-id is 0 or 2 is received, and recording is performed after 6 fields. Exposure for recording is performed, and readout for recording is performed after 8 fields.
The diaphragm device according to this embodiment switches the diaphragm to two stages of an open diaphragm and a small diaphragm. However, the diaphragm apparatus is not limited to this, and the diaphragm is switched to three or more stages, or the diaphragm diameter is continuously changed. It may be an iris diaphragm.
[0029]
【The invention's effect】
As described above, according to the present invention, when displaying a subject image of a moving image on a monitor, the diaphragm is fixed, so that there is no unnatural luminance change due to the switching of the diaphragm, and the diaphragm device is stopped. Therefore, power consumption can be reduced. On the other hand, when the release button is operated, the aperture means is controlled to an appropriate aperture value and the electronic shutter is controlled, so that a good image without smear can be recorded.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an electronic still camera according to the present invention.
FIG. 2 is a block diagram showing an internal structure of the electronic still camera shown in FIG.
FIG. 3 is a diagram showing a photometric area.
FIG. 4 is an AE program diagram showing an exposure control method according to the present invention.
FIG. 5 is a timing chart showing an AE sequence during video monitoring.
FIG. 6 is a timing chart showing an AE sequence during still image recording.
FIG. 7 is a diagram illustrating an initial measurement area of an open aperture and a small aperture during still image recording.
[Explanation of symbols]
14 ... Memory card (smart media)
16 ... Release button 24 ... Power switch 28 ... Liquid crystal monitor 32 ... Shooting lens 34 ... Optical viewfinder 42 ... Solid-state image sensor (CCD)
52 ... Digital signal processing circuit 53 ... Compression / decompression circuit 54 ... Frame memory 56 ... Microcomputer 58 ... AF evaluation circuit 61 ... AF drive circuit 70 ... Recording media / LCD control unit 74 ... LCD drive circuit 80 ... Slot device 85 ... Switch unit

Claims (3)

A diaphragm means for adjusting the amount of light incident on the image sensor via the photographing lens;
An electronic shutter for controlling the charge accumulation time in the imaging device;
Photometric means for measuring the amount of light incident on the image sensor;
A monitor capable of displaying a subject image based on an image signal obtained via the image sensor;
A monitor display switch for turning the monitor ON / OFF;
An optical viewfinder that allows the subject to be seen even when the monitor is off;
Strobe light emitting means for emitting strobe light;
Exposure control means for controlling the aperture means and the electronic shutter based on the photometric value measured by the photometry means, when the monitor is turned on to display a moving subject image and the release button is not operated, The aperture means is fixed at a preset aperture value, and only the electronic shutter is controlled for exposure control. When the release button is operated, the aperture means is controlled to an appropriate aperture value and the electronic shutter is controlled. Exposure control, and when the strobe light is emitted by the strobe light emission means, exposure control means for controlling the aperture means to an open aperture,
A means for selecting a macro mode ,
An electronic still camera , wherein the monitor is turned on when the macro mode is selected . A diaphragm means for adjusting the amount of light incident on the image sensor via the photographing lens;
An electronic shutter for controlling the charge accumulation time in the imaging device;
Photometric means for measuring the amount of light incident on the image sensor;
A monitor capable of displaying a subject image based on an image signal obtained via the image sensor;
Strobe light emitting means for emitting strobe light;
Exposure control means for controlling the aperture means and the electronic shutter based on the photometric value measured by the photometry means, when the monitor is turned on to display a moving subject image and the release button is not operated, The aperture means is fixed at a preset aperture value, and only the electronic shutter is controlled for exposure control. When the release button is operated, the aperture means is controlled to an appropriate aperture value and the electronic shutter is controlled. Exposure control means, and when the strobe light emitting means emits strobe light, exposure control means for controlling the aperture means to an open aperture,
A means for selecting a macro mode,
The exposure control means turns on the monitor, wherein the macro mode is selected, and the aperture means is controlled to a small aperture when the strobe light emission means emits strobe light. camera. The electronic still camera according to claim 1 or 2 , wherein the diaphragm means adjusts the amount of light incident on the image pickup device in stages by positioning a diaphragm hole formed in the diaphragm plate on the optical axis.

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