Photographic Light Output Power Control System and Method

• US 20120140088A1
• Filed: 02/12/2010
• Published: 06/07/2012
• Est. Priority Date: 02/12/2009
• Status: Abandoned Application

• Current Assignee: LAB Partners Associates Incorporated
• Original Assignee: LAB Partners Associates Incorporated
• Inventors: Clark, James E.
• Application Number:
  US13/201,185
• Publication Number:
  US 20120140088A1
• Time in Patent Office: Days
• US Class Current: 348/211.2
• CPC Class Codes: G03B 15/05 Combinations of cameras with electronic flash apparatus; Electronic flash units
• CPC Class Codes: G03B 2215/05 Combinations of cameras with electronic flash units
• CPC Class Codes: H04N 23/70 Circuitry for compensating brightness variation in the scene
• CPC Class Codes: H04N 23/74 by influencing the scene brightness using illuminating means

Abstract

Retasking of one or more photographic exposure controls of a camera to give direct manual control of a power output level of a lighting device by mapping a dynamic range of a photographic exposure compensation control of the camera to a dynamic range of a power output level of the lighting device. In another example, mapping is used in automatic tracking of changes in ISO and/or aperture of a camera to a power output level of a lighting device. In one example, automatic tracking of power control can be provided to lighting devices (such as studio strobes) that do not usually have access to automated power control from a camera.

Claims

1. A method of controlling a power output level of a photographic lighting device with a photographic exposure compensation control of a camera, the photographic lighting device being set to a first power output level and the photographic exposure compensation control being set to a first compensation value, the method comprising:

changing the photographic exposure compensation control to a second compensation value;

using the second compensation value and a mapping of the dynamic range of a photographic exposure compensation control of a camera to the dynamic range of a power output level of a photographic lighting device, determining a second power output level that corresponds to the second compensation value; and

automatically setting the photographic lighting device to the second power output level.

2. A method according to claim 1, wherein the camera is set to a first ISO and aperture setting combination and the second power output level is a desired power output level for the first ISO and aperture setting combination, the method further comprising:

adjusting the ISO setting and/or the aperture setting of the camera;

automatically determining an updated power output level based on the adjusted ISO and/or aperture settings and the mapping; and

automatically setting the photographic lighting device to the updated power output level.

3. A method according to claim 1, wherein the camera is set to a first ISO and aperture setting combination, the method further comprising:

determining a desired power output level for the photographic lighting device for the first ISO setting and the first aperture setting;

setting the photographic lighting device to the desired power output level;

adjusting the ISO setting and/or the aperture setting of the camera;

automatically determining an updated power output level; and

automatically setting the photographic lighting device to the updated power output level.

4. A method according to claim 3, wherein said determining a desired power output level includes:

changing the photographic exposure compensation control to a third compensation value;

using the mapping and the third compensation value, determining a third power output level that corresponds to the third compensation value; and

automatically setting the photographic lighting device to the second power output level.

5. A method according to claim 1, wherein said automatically setting the photographic lighting device is performed wirelessly.

6. A method according to claim 1, wherein said automatically setting the photographic lighting device includes controlling a capacitor voltage of a voltage controlled light emission power output lighting device.

7. A method according to claim 1, wherein the photographic lighting device is a voltage controlled light emission power output lighting device.

8. A method according to claim 1, wherein the photographic lighting device is set to operate in a non-TTL mode.

9. A method according to claim 1, wherein the photographic lighting device is set to a nonfully-automated mode.

10. A method according to claim 1, wherein the photographic exposure compensation control includes a camera exposure control and the camera is set to a manual or aperture priority mode.

11. A method according to claim 1, wherein the photographic exposure compensation control is a camera exposure compensation control.

12. A method according to claim 1, wherein the photographic exposure compensation control is a flash compensation control.

13. A method according to claim 1, wherein the photographic lighting device is set to a mode that is intended to require human interaction to change the power output level.

14. A method according to claim 1, wherein the photographic lighting device has the ability to adjust the illumination output level of the lighting device prior to triggering a flash burst.

15. A method of controlling a power output level of a photographic lighting device, the method comprising:

generating a mapping of the dynamic range of a photographic exposure compensation control of a camera to the dynamic range of a power output level of a photographic lighting device;

providing, after said mapping, the lighting device with the power output level set to a first power output level;

providing, after said mapping, the camera with the photographic exposure compensation control set to a first compensation value;

changing the photographic exposure compensation control to a second compensation value;

using the mapping and the second compensation value, determining a second power output level that corresponds to the second compensation value; and

setting the photographic lighting device to the second power output level.

16. A wireless photographic communication device for synchronizing a camera to a photographic lighting device, the wireless photographic communication device comprising:

a connection to an external connector of the camera that provides a signal including a value for a current photographic exposure compensation value of the camera;

a memory including information having a mapping of the dynamic range of a photographic exposure compensation control of the camera to a dynamic range of a power output level of the photographic lighting device;

a transmitter; and

a processor for correlating the current photographic exposure compensation value to a power output level of the lighting device and using the transmitter to wirelessly communicate the power output level of the lighting device to the lighting device.

17. A system of controlling a power output level of a photographic lighting device with a photographic exposure compensation control of a camera, the photographic lighting device being set to a first power output level and the photographic exposure compensation control being set to a first compensation value, the system comprising:

a means for changing the photographic exposure compensation control to a second compensation value;

a means for using the second compensation value and a mapping of the dynamic range of a photographic exposure compensation control of a camera to the dynamic range of a power output level of a photographic lighting device, determining a second power output level that corresponds to the second compensation value; and

a means for automatically setting the photographic lighting device to the second power output level.

18. A system according to claim 17, wherein the camera is set to a first ISO and aperture setting combination and the second power output level is a desired power output level for the first ISO and aperture setting combination, the system further comprising:

a means for adjusting the ISO setting and/or the aperture setting of the camera;

a means for automatically determining an updated power output level based on the adjusted ISO and/or aperture settings and the mapping; and

a means for automatically setting the photographic lighting device to the updated power output level.

19. A system according to claim 17, wherein the camera is set to a first ISO and aperture setting combination, the system further comprising:

a means for determining a desired power output level for the photographic lighting device for the first ISO setting and the first aperture setting;

a means for setting the photographic lighting device to the desired power output level;

a means for adjusting the ISO setting and/or the aperture setting of the camera;

a means for automatically determining an updated power output level; and

a means for automatically setting the photographic lighting device to the updated power output level.

20. A system according to claim 17, wherein said determining a desired power output level includes:

a means for changing the photographic exposure compensation control to a third compensation value;

a means for using the mapping and the third compensation value, determining a third power output level that corresponds to the third compensation value; and

a means for automatically setting the photographic lighting device to the second power output level.

21. A system according to claim 17, wherein said means for automatically setting the photographic lighting device is performed wirelessly.

22. A system according to claim 17, wherein said means for automatically setting the photographic lighting device includes controlling a capacitor voltage of a voltage controlled light emission power output lighting device.

23. A system according to claim 17, wherein the photographic lighting device is a voltage controlled light emission power output lighting device.

24. A system according to claim 17, wherein the photographic lighting device is set to operate in a non-TTL mode.

25. A system according to claim 17, wherein the photographic lighting device is set to a nonfully-automated mode.

26. A system according to claim 17, wherein the photographic exposure compensation control includes a camera exposure control and the camera is set to a manual or aperture priority mode.

27. A system according to claim 17, wherein the photographic exposure compensation control is a camera exposure compensation control.

28. A system according to claim 17, wherein the photographic exposure compensation control is a flash compensation control.

29. A system according to claim 17, wherein the photographic lighting device is set to a mode that is intended to require human interaction to change the power output level.

30. A system according to claim 17, wherein the photographic lighting device has the ability to adjust the illumination output level of the lighting device prior to triggering a flash burst.

31. A method of controlling a power output level of a photographic lighting device with a photographic exposure compensation control of a camera set to a first ISO setting and a first aperture setting, the method comprising:

determining a desired power output level for the photographic lighting device for the first ISO setting and the first aperture setting;

setting the photographic lighting device to the desired power output level;

adjusting the ISO setting and/or the aperture setting of the camera;

automatically determining an updated power output level; and

automatically setting the photographic lighting device to the updated power output level.

32. A method of wirelessly controlling a power level of a non-TTL capable photographic flash device having the ability to adjust the illumination output level prior to triggering a flash burst by a camera, the method comprising:

detecting an exposure compensation signal generated by manual input by a user actuating a control of a camera body operating in a mode that does not automatically adjust the aperture utilized for image acquisition based on the exposure compensation inputs of the camera body;

wirelessly communicating an instruction based on the exposure compensation signal to a remote non-TTL flash device;

automatically adjusting the amount of stored energy for flash illumination in the non-TTL flash device based on the instruction prior to initiation of a flash emission by the non-TTL flash device.

33. A method of wirelessly controlling a power level of a non-TTL capable photographic flash device having the ability to adjust the illumination output level prior to triggering a flash burst by a camera, the method comprising:

detecting an exposure compensation signal generated by manual input by a user actuating a control of a camera body operating in a mode that does not automatically adjust the aperture utilized for image acquisition based on the exposure compensation inputs of the camera body;

wirelessly triggering the emission of a remote non-TTL flash device to correspond with a first image acquisition by the camera body;

detecting an aperture setting and a gain setting of the camera body, wherein the aperture and/or gain setting is different from the corresponding setting of the camera body used for the first image acquisition;

wirelessly adjusting the power output capability of the non-TTL flash device prior to flash light emission of the non-TTL flash device based on a calculated power adjustment, the power adjustment calculated from the exposure compensation signal, the aperture setting, and the gain setting; and

wirelessly triggering the emission of the remote non-TTL flash device to correspond with a second image acquisition by the camera body.