Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
  • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
  • G03B7/091—Digital circuits
  • G03B7/097—Digital circuits for control of both exposure time and aperture

Definitions

• the present invention relates to a film-loading type camera in which an exposure condition is automatically set and a method for setting an exposure condition of the same.
• Background Art Fully automatic compact cameras are in widespread use, which automatically sets an exposure condition while requiring a user to do nothing except for loading a film and which permits the user to take a satisfactory photograph by simply depressing a shutter release button.
• the cameras of this type are configured to automatically perform the focus control and control of auxiliary light, as well as the exposure control, and permit everyone to take a photograph by merely powering up and releasing the shutter.
• Such cameras have a function of effecting correct exposure for a major subject by automatic light emission from a built-in flash unit even in scenes of dark subject such as indoor scenes and night scenes.
• the flash light presents the convenience of enabling photography in any environments as described above, but photographs taken with flash light often lack the realistic atmosphere in the scene for the following reasons: - the flash light may not reach the background to result in dark, dismal description relative to the major subject; and - the main subject is taken with light which does not exist in the scene, and thus may give an unnatural impression.
• Patent Document 1 discloses the invention in which the film speed is set to a lower value where the subject is not more than a specific luminance.
• Patent Document 2 discloses the invention in which the frequency of occurrence of hand-shakes is raised and inconveniences compact-camera users liking to easily enjoy photography since the system sensitivity becomes low with a low-speed film loaded. It is therefore an object of the present invention to provide a camera capable of automatically taking a photograph with good atmosphere while being free of the aforementioned defects, even if such an auxiliary light as a flash light is not used.
• the exposure setting unit carries out the exposure compensation only when the photometric value is not more than a specific value.
• the exposure setting unit carries out the exposure compensation when the camera is loaded with a film of a film speed with which the system sensitivity Ls is not more than 4.
• the maximum shutter speed T 0 is restricted not to exceed a certain value.
• the exposure setting unit calculates the system sensitivity Ls with the upper time limit T 0 of 1/30 seconds if the upper time limit To is not set to a specific value. By adopting this constitution, it is feasible to diminish the possibility of hand-shake effect even if the hand-shake control shutter speed is not set.
• the exposure setting unit may include a photometer measuring luminance of ambient light in a photographic field; a film speed sensor detecting a film speed of the loaded film; and a controller setting the exposure condition with calculating the system sensitivity Ls by a measurement signal fxom the photometer and a detection signal from the film speed sensor in order to control opening operation of a shutter. Further, it is preferable that no auxiliary light is emitted when the exposure setting unit ca ⁇ rries out the exposure compensation. By adopting this constitution, it is feasible to avoid an artificial impression of the subject. Moreover, the present invention can be described as a method for setting an exposure condition of a film-loading type camera with similar operations and effects.
• Fig. 1 is a perspective view to show the appearance of a camera according to the first embodiment of the present invention.
• Fig. 2 is a perspective view to show the appearance of the camera according to the first embodiment of the present invention.
• Fig. 3 is an illustration to illustrate a display in the camera of Fig. 1.
• Fig. 4 is a schematic diagram to show a configuration of the camera of Fig. 1.
• Fig. 1 is a perspective view to show the appearance of a camera according to the first embodiment of the present invention.
• Fig. 2 is a perspective view to show the appearance of the camera according to the first embodiment of the present invention.
• Fig. 3 is an illustration to illustrate a display in the camera of Fig. 1.
• Fig. 4 is a schematic diagram to show a configuration of the camera of Fig. 1.
• Fig. 1 is a perspective view to show the appearance of a camera according to the first embodiment of the present invention.
• Fig. 2 is a perspective view to show the appearance of the camera according to the
• FIG. 5 shows an example of spectral sensitivity of a silicon photodiode photometric sensor equipped with an infrared cut filter.
• Fig. 6 shows spectral energy distributions of tungsten light (solid line as CIE standard source A) and a light source according to daylight (dotted line as CIE standard source C) .
• Fig. 7 shows typical spectral sensitivities off a color negative film (solid line as a blue-sensitive layer, dotted line as a green-sensitive layer, and chain line as a red-sensitive layer) .
• FIG. 8 is an illustration showing an example of: a flowchart from depression of a release button to completion of photography in an automatic mode of the camera in Embodiment 1 according to the present invention.
• Fig. 8 is an illustration showing an example of: a flowchart from depression of a release button to completion of photography in an automatic mode of the camera in Embodiment 1 according to the present invention.
• Fig. 8 is an illustration showing an example of: a flowchart
• FIG. 9 is a ⁇ Ev-Bv chart wherein a solid line indicates an exposure control in the automatic mode where a film of the ISO speed of 1600 is loaded on the camera of Embodiment 1 and wherein a dashed line indicates an exposure control in the automatic mode where a film of the ISO speed of 800 is loaded on the same camera, in which the horizontal axis represents the photometric value (Bv values, together with L- values) by centerweighted metering means and in which the vertical axis represents the exposure compensation amount ⁇ Ev [EV] .
• Fig. 10 is a program chart in the automatic mode where the film of the ISO speed of 1600 is loaded on the camera of Embodiment 1 according to the present invention.
• Fig. 1 is a perspective view showing the front- side appearance of a camera according to the first embodiment of the present invention
• Fig. 2 a perspective view showing the back-side appearance of the camera according to the embodiment.
• the camera of the present embodiment is an application of the present invention to a lens shutter camera to be loaded with a film cartridge of the 135 film format.
• This camera is provided with a release button 11 at an upper end of a camera body 10.
• a lens barrel 13 equipped with a photographic lens 12 is mounted in the central part of the front surface of the camera body 10.
• the lens barrel 13 used herein is a photographic lens barrel, for example, comprised of a monofocal lens with the focal length of 24 mm and full-aperture F2.0, and a shutter and being capable of autofocus operation.
• the light projector 14 and the light receiver 16 constitute a range finder for measuring the distance to the subject, for example, based on the principle of triangulation.
• the camera body 10 is also provided with a photometer 18.
• the photometer 18 functions as a photometric means for measuring the luminance of ambient light in a photographic field.
• This photometer 18 is, for example, one equipped with an SPD device (incorporating an infrared cut filter on the optical path) as a centerweighted averaging metering sensor.
• This SPD device is approximately directed onto the optical axis of the photographic lens optical system.
• a shutter 19 is incorporated on the optical axis of the photographic lens 12 inside the camera body 10.
• the shutter 19 includes sectors also used as diaphragm blades for determining an exposure amount necessary for the film.
• This shutter 19 is, for example, a two-blade lens shutter having the f-number of 2.0 (f/2.0) at full opening and the control range Ev of 2 to 16 [EV] .
• a finder eyepiece window 41 and a warning indicator 42 provided in the upper part on the back side of the camera body 10.
• the warning indicator 42 is, for example, one having a light emitting device of a two color type of red and green.
• a back lid 43 is provided below the finder eyepiece window 41 and the warning indicator 42. While the back lid 43 is opened, a film cartridge is loaded into the camera body 10.
• a battery lid 44 is provided beside the back lid 43. While the battery lid 44 is opened, a battery is loaded into the camera body 10.
• the back lid 43 is provided with a main switch 45, a mode switch 46, date switches 47, and a display 50.
• the main switch 45 is a switch for switching the whole camera on and off.
• the mode switch 46 is a switch for enabling switching among photography modes of the camera.
• the date switches 47 are switches used for setting, correction, etc. of the date and others.
• the display 50 is a display means for displaying a selected photography mode of the camera, the date, the number of remaining frames of the film, and so on.
• This display 50 is, for example, an LCD.
• Fig. 3 shows an enlarged view of the display 50.
• the display 50 is provided, for example, with a photography mode display 51, a date display 52, and a number-of-frames display 53.
• the photography mode display 51 is a portion for displaying a photography mode selected and includes an autophotography mark 51a, a flash photography mark 51b, a non-flash photography mark 51c, and a natural photography mark 51d.
• the date display 52 is a part for displaying the date, for example.
• the number-of- frames display 53 is a part for displaying the number of remaining frames of the film.
• Fig. 3 shows the display 50 in which all the marks and others are in a displayed state.
• Fig. 4 is a block diagram schematically showing an electric configuration of the camera according to the present embodiment.
• the camera of the present embodiment is provided with a controller 20.
• the controller 20 performs the control of the entire camera and includes, for example, a CPU, a ROM, a RAM, an input signal circuit, an output signal circuit, and so on.
• the ROM of the controller 20 stores programs for control processing and arithmetic processing.
• the RAM of the controller 20 stores various data used in the control processing and arithmetic processing.
• the photometer 18, the shutter 19 and this controller 20 are the minimum elements for constituting an exposure setting unit 80 to set an exposure condition, which will be described later.
• the display 50 is connected to the controller 20.
• the display 50 provides indications of a selected photography mode, the date, the number of remaining frames of the film, etc. in accordance with a display control signal from the controller 20.
• the main switch 45, the mode switch 46, and the date switches 47 are connected to the controller 20.
• the controller 20 powers the camera on and off in response to input at the main switch 45.
• the controller 20 sets or changes the photography mode in response to input at the mode switch 46.
• the controller 20 also sets or changes the date and others in response to input at the date switches 47.
• the light projector 14 and the light receiver 16 constitute a ranging calculation unit, and each of them is connected to the controller 20.
• the controller 20 outputs an emission control signal to the light projector 14 to perform a light projection control.
• the controller 20 makes the light receiver 16 receive reflected light of the projected light, and detects a distance to a subject, based on the received light signal.
• the flash unit 17 is connected to the controller 20.
• the controller 20 outputs an emission control signal to the flash unit 17 under predetermined conditions to make the flash unit emit light.
• the photometer 18 is connected to the controller 20.
• the controller 20 receives a measurement signal from the photometer 18 and converts the luminance of ambient light to a Bv value of the APEX (Additive System of Photographic Exposure) unit.
• the shutter 19 is connected to the controller 20.
• the controller 20 makes the shutter 19 perform an opening operation according to an exposure control when the release button 11 is depressed.
• the battery 61 is connected to the controller 20.
• the battery 61 is a power supply for supplying power to each part of the camera.
• the controller 20 determines whether the battery 61 stores the amount of electricity enough for the photographic operation and others.
• An external memory 62 is connected to the controller 20.
• the external memory 62 stores various control parameters and others.
• the external memory 62 is, for example, an EEPROM.
• a release switch 63 is connected to the controller 20.
• the release switch 63 is a switch to be changed over with depression of the release button 11. With input of the release switch 63 the controller 20 determines that the release button 11 was depressed.
• a date copier 64 is connected to the controller 20.
• the date copier 64 is a copy mechanism for copying the date and others onto the film.
• a film speed sensor 65 is connected to the controller 20, and the controller 20 receives a detection signal from the film speed sensor 65.
• the film speed sensor 65 is a film speed detecting means for detecting a film speed of the film loaded in the camera body 10.
• the film speed sensor 65 reads the CAS code indicated on the cartridge containing the film, to detect the film speed.
• the film speed sensor 65 has four conducting terminals (one of which is a common terminal) for reading the upper three bits inside the film cartridge chamber. The upper three bits indicate the speed value of one step unit out of the CAS codes printed in a checkered pattern on the side face of the film cartridge.
• the film speed sensor 65 also has a film speed setting mechanism of recognizing and setting the film speed by the CPU built in the camera on the basis of conduction signals from the terminals. In cases where there are no CAS codes or where a reading error occurs, the film speed is set to the speed of 100. The film speed is detected as an ISO (International Organization for Standardization) speed. Next, the system sensitivity of the camera will be described. In the present invention, the brightness of each scene will be indicated by an L-value in conformity with the APEX system. The L-value is defined as follows using an opening time value Tv and an aperture value Av of the lens to achieve proper exposure in use of a photographic sensitive material of the ISO speed of 100.
• the f- nu ber of the stop of the lens is used.
• the system sensitivity Ls is defined as a minimum L-value of brightness enabling photography without hand-shakes, and is expressed by the equation below, using the maximum shutter speed T 0 of the camera and the f-number F 0 at full opening of the camera lens, and the ISO speed (arithmetic expression) S of the sensitive material loaded.
• the upper time limit can be determined in conformity with this assumption. Since the probability of occurrence of hand-shakes can be decreased as the shutter speed becomes faster, it is preferable to set the shutter speed as fast as possible in consideration of the necessary system sensitivity. According to the above definition of Ls, correct exposure can be made if the brightness of a scene is not less than the system sensitivity. If the brightness of a scene is not more than the system sensitivity, correct exposure will not be made and the exposure will be underexposure.
• the film speed can be acquired in such a way that the cameras reads the speed information described on the film cartridge.
• the film speed code called the CAS code is ndicated by five bits of either conduction or insulation of electric contacts on the cartridge, and the camera can read the information.
• the term "a specific system sensitivity can be implemented” means that the system sensitivity calculated by the camera-controllable full-aperture diaphragm stop and hand-shake control shutter speed, and the film speed of the loaded film is not more than a certain value. Namely, a threshold is prepared on the camera side and, if a system sensitivity becomes not more than the threshold, "a specific system sensitivity can be implemented.”
• the system sensitivity Ls for exposure control of the present invention may be any value, but preferably Ls ⁇ 4, and more preferably Ls ⁇ 3. Next, the exposure compensation of the camera will be described.
• the major subject is a person or people illuminated by indoor illumination. If under such circumstances correct exposure is calculated based on a photometric value obtained by photometry of the camera, particularly, by the centerweighted averaging metering often used in the compact cameras, the major subject will be photographed in underexposure and will result in a dark, dismal photograph.
• the photometric value stated herein is brightness of a scene measured by the photometric means of the camera and is indicated as a luminance value Bv according to the APEX system (the L-value is given by "Bv + 5") .
• the cause of the above-mentioned phenomenon 1) lies in the fact that the indoor illumination is mainly illumination from the ceiling and is designed on the basis of the horizontal illuminance and illuminance near the wall, and little consideration is given to the illuminance on the vertical plane near the center of the room.
• the illuminance on the vertical plane near the center is about 1-3 EV darker than that near the wall. Since the photometric value of the camera, particularly, the photometric value by the centerweighted averaging metering is largely affected by the illuminance on the wall surface, the exposure control based on the raw photometric value of the camera results in underexposure (insufficient exposure) of about 1-3 EV for the major subject.
• Fig. 5 is a diagram showing typical spectral sensitivity of SPD photometer (with infrared cut filter) .
• the photometry of the camera is performed with a photometric sensor with the spectral sensitivity range near 500-600 nm as shown in Fig. 5 (the photometric sensors widely used include CdS cells or silicon photodiodes (SPDs) with an infrared cut filter) .
• Fig. 6 is a diagram showing spectral examples of light sources.
• the energy distribution of the CIE standard source A (correlated color temperature: about 2850K) , which is a typical tungsten light source, has a slope against wavelength, as indicated by a solid line in Fig. 6, and the energy in the region of 400-500 nm is lower than in the region of 500-600 nm.
• Si ( ⁇ ) the spectral sensitivity of the negative film at the wavelength ⁇ (i 0, 1, or 2 for the red-sensitive layer, the green-sensitive layer, or the blue-sensitive layer, respectively), R( ⁇ ) the reflectivity of the object at the wavelength ⁇ , and E ( ⁇ ) the spectral energy of the light source at the wavelength ⁇ .
• the integral value calculated by this integration is an exposure amount for the color negative film. In the ordinary daylight case (correlated color temperature: about 5000K) , exposure values are at the same level for the green-sensitive layer and the blue- sensitive layer close to the spectral sensitivity of the photometric sensor, but in the tungsten light case, the exposure amount for the blue-sensitive layer becomes 1-2 EV lower than that for the green-sensitive layer.
• This phenomenon lies in the fact that the spectrum thereof is substantially in the green light region although an ordinary photometric sensor is designed based on the spectral sensitivity of human eyes, i.e., based on the spectral sensitivity according to the standard luminous efficiency.
• an ordinary photometric sensor is designed based on the spectral sensitivity of human eyes, i.e., based on the spectral sensitivity according to the standard luminous efficiency.
• a and standard source C are adjusted in intensity (illuminance) thereof so that the photometric sensor with the spectral sensitivity shown in Fig. 5 provides the same photometric value and that a color negative film for daylight with the spectral sensitivities shown in Fig. 7 is exposed to their light.
• the exposure amount for the green-sensitive layer demonstrates little change (decrease of ⁇ 0.02 EV) but the exposure amount for the blue-sensitive layer does the decrease of 1.56 EV (while the exposure amount for the red-sensitive layer shows the increase of 0.88 EV) in the case of the light source A of the lower color temperature .
• the major subject is darker than the photometric value of the camera in many cases and the present invention has solved this problem by the exposure compensation of not less than +1.5 EV for the photometric value.
• the exposure compensation breadth of +1.5 EV is a minimum correction amount, and the exposure compensation is preferably not less than +2 EV and more preferably not less than +3 EV.
• the magnitude of the exposure compensation may be further corrected using information except for the photometric value. For example, where a sensor to detect color temperature is available, the exposure compensation breadth can be corrected according to the color temperature measured.
• a preferred correction is such that the exposure compensation is +3 EV at 3000K and +2 EV at 5000K.
• the exposure compensation method may be any method that can increase the exposure amount as a result. It may be a method of adding an exposure compensation value to the photometric value and feeding the result to an arithmetic circuit of exposure control, or a program for this exposure control may be preliminarily defined as a table against photometric values. Another method may be to perform a calculation using a result of subtraction of a desired exposure compensation amount from the film speed. In the exposure compensation of the present invention, it is preferable to change on/off of the exposure compensation and the level of the exposure compensation in accordance with brightness of the subject.
• the purpose of the exposure compensation is to correct the influence of artificial illumination in the indoor and other circumstances, and no exposure compensation is needed under circumstances clearly different from the artificial illumination.
• One of preferred exposure control methods is a method of carrying out no exposure compensation for brightness determined to be daylight and outdoor without doubt and carrying out the exposure compensation for brightness determined to be night or indoor with high possibility.
• it is also possible to adopt a method of switching the exposure control with a slope of exposure compensation amount against brightness Even in the daylight and outdoor cases, however, the major subject can be relatively dark because of backlight, depending upon scenes.
• auxiliary light auxiliary light
• the photography without emission of flash light can record the atmosphere of the light source in that situation as it is, and it results in providing a photograph with more realistic atmosphere, thus enabling natural photography while the photographer and subject both are not excessively conscious of the camera. It is, however, preferable to equip the camera with a function of emitting a warning signal of underexposure to the photographer to encourage use of auxiliary light, in the region of not more than the system sensitivity.
• Fig. 8 is a flowchart showing the control processing in the automatic photography mode of the camera according to the present embodiment.
• the camera of the present embodiment performs characteristic operations as described below as to exposure setting and emission of flash.
• the automatic mode is an initial operation mode upon application of power, and the display 50 provides a mode display of "AUTO.”
• the control processing shown in Fig. 8 is started according to the film speed of the loaded film.
• the first step S10 is to determine whether the remaining level of the battery 61 is not less than a predetermined value.
• the display When the remaining level of the battery 61 is less than the predetermined value, the display provides a battery exhaustion display or the like (S12) , and the control processing is terminated.
• the calculation of Bv value is carried out (S14) .
• the calculation process of Bv value is carried out by converting a measurement signal from the photometer 18 to a Bv value. Then the flow goes to SI 6 to calculate the system sensitivity Ls and to determine whether the system sensitivity Ls is not more than 3. Namely, it is determined whether the speed value Sv of the film is not more than 9.
• the system sensitivity Ls is determined to be not more than 3.
• the system sensitivity Ls is determined not to be not more than 3.
• a ranging calculation is carried out (S20).
• the ranging calculation process is a process of calculating the distance to the subject on the basis of an output signal from the light receiver 16.
• the flow goes to S30 to determine whether the shutter speed is longer than 1/30 [second] .
• the flow moves to S34.
• the shutter speed is set to 1/30 [second] (S32) and the flow goes to S34.
• S34 is to perform an AF driving process.
• the AF driving process is a process of moving a focusing lens according to the distance to the subject.
• the controller 20 outputs a drive control signal to a focus driving section (not shown) and the focusing lens is moved to be focused at the distance to the subject, thus achieving focus adjustment.
• the flow goes to S36 to perform a shutter opening operation and to perform emission of light (flash emission) under predetermined conditions. Then the flow moves to S58.
• the flash unit (strobe) is activated under conditions that the exposure amount with flash becomes correct, except for a case where the photometric luminance value is not less than Bv 5 (i.e.
• the photographic environment is recognized as a daytime and outdoor scene, and the flow goes to S20.
• the photographic environment is recognized as an indoor scene or as an evening or night outdoor scene, and the flow goes to S40.
• S40 is to perform a ranging calculation.
• the ranging calculation process is a process of calculating the distance to the subject, based on an output signal from the light receiver 16.
• ⁇ Ev is an exposure compensation amount and is set based on the Bv value.
• an exposure control table of correspondence between Bv and ⁇ Ev is preliminarily set, and ⁇ Ev is determined based on this exposure control table.
• the Bv value falls in the range of 1 to 5 [EV]
• ⁇ Ev is set at +3 [EV] .
• the Ev value is calculated using the ⁇ Ev thus set.
• the flow goes to S44 in Fig. 8 to calculate the f-number and the shutter speed based on the Ev value.
• This calculation process is carried out, for example, by preliminarily storing an exposure program chart as shown in Fig. 10, in the controller 20 or in the external memory 62 and by determining the f-number and shutter speed based on the exposure program chart. Then the flow goes to S46 to determine whether the Bv value is smaller than the system sensitivity. When the Bv value is determined not to be smaller than the system sensitivity, the flow goes to S50. It is determined on the other hand that the Bv value is smaller than the system sensitivity, a warning process is carried out.
• the warning process is a process of issuing a warning of underexposure, and is carried out, for example, by blinking the warning indicator 42 and a predetermined mark on the display 50 on and off.
• the flow goes to S50 to determine whether the shutter speed is longer than 1/30 [second] .
• the flow goes to S54.
• the shutter speed is set to 1/30 [second] (S52) and the flow goes to S54.
• S54 is to perform an AF driving process.
• the AF driving process is a process of moving the focusing lens according to the distance to the subject.
• the controller 20 outputs a drive control signal to the focus driving section (not shown) and the focusing lens is moved so as to be focused at the distance to the subject, thus achieving focus adjustment.
• S18 the judgment whether the Bv value is less than 5
• S36 or S56 the shutter opening operation
• the photography is carried out without emission of flash, where the photometric value is less than Bv 5 (i.e. L-value of 10) .
• the exposure value is so set that the shutter speed is not smaller than 1/30 [second], which is the hand-shake control shutter speed.
• the aperture is fixed to F2.0 and the shutter speed to 1/30 [seconds] .
• the warning indicator 42 and a predetermined icon on the display 50 are blinked on and off to encourage the photographer to perform an operation of switching the mode into the flash emission mode.
• the display 50 provides a display of natural photography mark 51d.
• This lens returning operation is a process of returning the focusing lens to a predetermined standby position.
• the controller 20 outputs a drive control signal to the focus driving section (not shown) to carry out the process.
• a film frame feed is carried out (S60) and the camera goes into a standby state (S62) .
• the exposure compensation amount may be any other value than +3 EV as long as the exposure compensation is not less than +1.5 EV. Operations in the other photograph modes will be described below.
• an exposure program in a forced flash emission mode is the same as that in the aforementioned automatic photography mode, but the flash unit is activated under such control as to achieve an exposure amount according to ranging information.
• the exposure is kept at the same exposure compensation amount of +3 EV as in the automatic mode, and the exposure is done with flash in intensity correct for ISO 1600.
• the exposure and flash light quantity are the same as those in the forced flash emission mode and a single or a plurality of pre-emissions are given in an emission quantity lower than that in the photography before opening of the shutter, in order to prevent the red-eye phenomenon with flash emission.
• an exposure program is the same as that in the red-eye prevention mode except for release of the hand-shake control.
• a well-known color temperature detecting sensor unit may be additionally mounted on the front surface of the camera and the camera is configured so that in the operation in the automatic mode where the film with the film speed not less than 1600 (in the ISO speed) is loaded, the exposure compensation amount is set to +2 EV at color temperatures of not less than 3800K and to +3 EV at color temperatures of less than 3800K.
• the shutter speed when compared with the first embodiment, can be set faster in cases where the color temperature is not less than 3800K, which provides an effect of further reducing the frequency of hand-shakes and shakes of moving bodies.
• Industrial Applicability A photographer can take a photograph with good atmosphere automatically without use of such an auxiliary light as a flash light.

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• 2004
  • 2004-06-18 JP JP2004181480A patent/JP2005250433A/ja active Pending
• 2005
  • 2005-02-04 WO PCT/JP2005/002099 patent/WO2005076597A2/en active Application Filing
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