If you wish to link FE Lock to any focusing point other than the central one, you must select the focusing point manually while Custom Function F-13 is set to 1.

If Custom Function No. F-4 (AF activation method and AE lock button operation) is set to 1 or 2, FE Lock cannot be used.

6Recompose if necessary and press the Shutter button completely within 8 seconds to capture the image. Correct flash exposure of the subject measured by the FE Lock is assured when the flash exposure confirmation signal lights up on the EX-series Speedlite. (Refer to the Speedlite instruction book for details.)

The proper exposure value is retained in memory—even if you release the FE Lock button—for 8 seconds or until the image is captured, or one of the camera's mode buttons is pressed, or the Speedlite or camera is turned Off, whichever comes first.

Adjusting the Background Exposure in FE Lock

After preflashing the subject with the FE Lock button, adjust the background exposure by turning the Quick Control Dial. The background exposure level is displayed on the exposure level scale in the viewfinder and on the Top LCD panel. Correct ambient exposure according to the camera's meter is indicated by the triangle index at the center of the scale.

The Quick Control dial does not adjust background exposure when the camera is set to Bulb mode, or in low light situations when the camera is set to Program or DEP.

For information on Flash Exposure Compensation (which is not the same as ambient or background exposure compensation), refer to the section on Flash Exposure Compensation later in this chapter.

What is FP Flash Mode?

FP (focal-plane) flash, or high-speed sync, enables an EX-series Speedlite to synchronize with a shutter speed faster than the camera's maximum sync speed, when used with a compatible camera like the DCS 500 Series camera. Therefore, even in bright daylight conditions, a fast lens can be used at a wide aperture to blur the background and emphasize the subject in portraiture, for example. FP flash is automatic and simple to use. It is available in Program, Shutter-priority AE, Aperture-priority AE and Manual modes (P, Tv, Av, & M). FP flash can be combined with E-TTL or FE Lock.

FP flash differs from conventional electronic flash in that its effective output (guide number) varies according to shutter speed. (In other words, the Speedlite's usable flash-to- subject distance range decreases according to shutter speed with FP flash.) Please refer to the EX-series Speedlite instruction book for details.

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Exposure

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Kodak DCS500 manual Adjusting the Background Exposure in FE Lock, What is FP Flash Mode?