Using Flash Control Options

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With the 40D, many of the onboard and accessory flash settings are available on the camera menus. The Set-up 2 (yellow) menu offers onboard flash settings including the first or second curtain shutter sync, Flash Exposure Compensation, and E-TTL II or Average exposure metering.

When an accessory Speedlite is mounted, you can use the Set-up 2 (yellow) menu to set Flash Exposure Compensation and choose between Evaluative or Average metering. In addition, you can change or clear the Custom Function (C.Fn) settings for compatible Speedlites such as the 580 EX II. If the Speedlite functions cannot be set with the camera, these options display a message notifying you that the flash is incompatible with this option. In that case, set the options you want on the Speedlite itself.

To change settings for the onboard or compatible accessory EX-series Speedlites, follow these steps:

1. Set the camera to a Creative Zone mode. If you're using an accessory Speedlite, mount it on the camera and turn it on.

2. Press the Menu button, and then press the Jump button until the Set-up 2 (yellow) menu is displayed.

3. Turn the Quick Control dial to highlight Flash Control, and then press the Set button. The

Flash Control screen appears with options for the built-in and external flash.

8.6 For this image, using the same set up as the last few images, I set the flash metering to Average rather than Evaluative metering as used in the previous images.

4. Turn the Quick Control dial to highlight the option you want, and then press the Set button.

Choose a control option from the Flash Control menu and press the Set button. Table 8.4 lists the menu settings, options, and suboptions that you can choose from to control the flash.

8.7 Using the same set up from previous images, here I used two EX-series Speedlites, a 580 EX Speedlite mounted on the camera and bounced off the ceiling, and a 550 EX Speedlite set up on a table behind the wine and glasses. The 550 was set up as a slave and fired wirelessly from the 580. Notice how the backlight illuminates the center of the bottle and the glasses and adds depth to the scene. Exposure: ISO 100, f/5.6, 1/5 sec.

Table 8.4 Flash Control Menu Options

Setting

Option(s)

Suboptions/Notes

Built-in flash func. setting

Flash mode Shutter Sync

(Cannot be changed from E-TTL II)

1st curtain: Flash fires immediately after the exposure begins.

2nd curtain: Flash fires just before the exposure ends. Can be used with slow-sync speed to create light trails behind the subject.

Flash exp. Comp

Press the Set button to activate the Exposure Level meter, and then turn the Quick Control dial to set positive or negative compensation.

E-TTL II

Evaluative (default) Sets exposure based on an evaluation of the entire scene. Average: Flash exposure is metered and averaged for the entire scene. Results in brighter output on the subject and less balancing of ambient background light.

External flash func. setting

Flash mode Shutter sync

E-TTL II Hi-speed

1st curtain: Flash fires immediately after the exposure begins.

2nd curtain: Flash fires just before the exposure ends. Can be used with slow-sync speed to create light trails behind the subject.

Exposure

Bracketing)

Press the Set button to activate the Exposure Level meter, and then turn the Quick Control dial to set the bracketing amount.

Flash exp. comp

Press the Set button to activate the Exposure Level meter, and then turn the Quick Control dial to set positive or negative compensation.

E-TTL II

Evaluative Average

External flash C.Fn setting

External flash C.Fn setting

Clear ext. flash C.Fn set.

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