Wireless Flash Photography

For Type-B Cameras

Basic Flash Photography Advanced Flash Photography
1. Using Flash in Full Auto Mode.78 2. Using Flash in Other Camera Modes..80 1. Flash Exposure Compensation.86 2. FEB (Flash Exposure Bracketing).88 3. Bounce Flash..90 [1] 1. 2. 3. 4. 5. 6. Wireless System Setup and Testing.100 Setting the 550EX as the Master Unit.100 Setting the 550EX as a Slave Unit.100 Setting the Master/Slave Channel.101 Setting the Slave ID..103 Master Flash ON/OFF.104 Wireless Flash Range..105

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For Type-A cameras, see pages 10 to 76 and 112 to 125. For Type-B cameras, see pages 10 to 22 and 77 to 125.
6. Pilot Lamp and Test Firing..17 7. Flash Exposure Confirmation..18 8. Using the Zoom Button and Wide Panel..18 9. Flash Mode..21 (1) Av: Aperture-Priority AE and E-TTL Autoflash.27 (2) Tv: Shutter Speed-Priority AE and E-TTL Autoflash.29 4. FEB (Flash Exposure Bracketing).38 5. Bounce Flash..40 6. Close-Distance Flash Photography.43 [2] Wireless E-TTL Autoflash.60 1. Wireless E-TTL Autoflash With Flash Ratio OFF..60 2. Wireless E-TTL Autoflash With Flash Ratio ON..63 [3] Wireless Manual Flash.71 1. Wireless Manual Flash With Uniform Flash Output..71 (1) Av: Aperture-Priority AE and E-TTL Autoflash.81 (2) Tv: Shutter Speed-Priority AE and E-TTL Autoflash.83 4. Close-Distance Flash Photography.92 5. Manual Flash Mode..93 [2] Wireless Manual Flash.107 1. Wireless Manual Flash With Uniform Flash Output.107 2. Wireless Manual Flash With Varied Flash Output.108 [3] Wireless Stroboscopic Flash.109 [4] Manual or Stroboscopic Flash With a Slave Unit.110
10. Setting the Film Speed..21 11. LCD Panel Illumination..21 12. AF-Assist Beam.22 Automatic Reversion to Default Settings..22 (3) M: Manual Exposure and E-TTL Autoflash.30
7. Manual Flash Mode..44 8. Stroboscopic Flash.46 9. Second-Curtain Synchronization.49 10. Modeling Flash..50 2. Wireless Manual Flash With Varied Flash Output.72 [4] Wireless Stroboscopic Flash.73 [5] Manual or Stroboscopic Flash With a Slave Unit.74 1. Setting Manual Flash With a Slave Unit..74 2. Stroboscopic Flash With a Slave Unit.75 (3) M: Manual Exposure and E-TTL Autoflash.84
6. Stroboscopic Flash.95 7. Second-Curtain Synchronization.98 1. Manual Flash With a Slave Unit.110 2. Stroboscopic Flash With a Slave Unit.111 Custom Functions..112 Canon Speedlite 550EX System..114 Troubleshooting Guide..116 Specifications..118

11. LCD Panel Illumination
Press the < > button to illuminate the LCD panel for 12 sec. To turn off the illumination, press the < > button again.
The illumination stays on longer than 12 sec. if you press any button other than the < > and < > buttons.

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12. AF-Assist Beam
In low-light or low-contrast situations, the Speedlite emits the AF-assist beam automatically to assist autofocusing. The AF-assist beam is compatible with the AF of all EOS cameras. The AF-assist beam is effective with 28mm and longer lenses. Its effective range in darkness is indicated in the table below. See page 123 for details on when the AF-assist beam is emitted.
Position Center Periphery Effective Range Approx. 0.6 - 10 m / 2 - 33 ft. Approx. 0.6 - 5 m / 2 - 16.4 ft.
Automatic Reversion to Default Settings
When Speedlite 550EX is attached to an EOS camera equipped with a < > button, pressing the < > button resets the Speedlites settings (except the Custom Functions) to its default settings
As a Normal Speedlite E-TTL autoflash* (All related settings are canceled.) Auto zoom E-TTL autoflash* (All related settings are canceled.) Master flash ON No flash ratio setting * With the EOS-1N and EOS-1, TTL autoflash takes effect.
As a Wireless Master Unit

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For Type-A Cameras

Basic Flash Photography

When the Speedlite 550EX is attached to a Type-A camera such as the EOS3, you can take flash pictures with E-TTL autoflash as easily as normal autoexposure (AE) pictures. As with evaluative metering, the E-TTL autoflash system uses a multi-zone sensor. A preflash is fired for evaluative flash metering and the reading is stored in memory. Since E-TTL autoflash is linked to the active focusing point, the flash exposure is highly accurate. The result is a natural-looking flash picture with excellent balance between the flash light and ambient light.
This section assumes that the Speedlite 550EX is used with a Type-A camera. Before proceeding, first turn on the EOS-3 and the 550EX. Set the 550EXs wireless selector to OFF. For EOS-3 operations, refer to the EOS-3 Instructions.

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1. Using Flash in Full Auto Mode
Set the cameras picture-taking mode to P (Program AE) or (Full Auto). Flash photography will then be as easy as normal AE photography. The camera sets the aperture and shutter speed automatically to suit a wide variety of lighting conditions including outdoor fill flash. The E-TTL autoflash system sets the flash exposure automatically.

1 SetP.the cameras picture-taking mode to
2 Set the. 550EXs flash mode to 3 Focus the subject.
The shutter speed and aperture will be displayed in the viewfinder. The shutter speed will be set automatically at 1/60 sec. or faster (up to the top sync speed). The aperture is also set at the same time.
the subject 4 Check that displayed on is within the flash range the 550EXs LCD panel. icon is displayed 5 Check that the then take the picture.in the viewfinder,
A preflash is fired immediately before shutter release and the main flash. The subjects meter reading is obtained with the preflash and used to set the output of the main flash. An optimum flash exposure is thereby obtained.

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Using Flash in Full Auto Mode
6 After the flash fires, check that the flash exposure confirmation lamp
lights. When a correct flash exposure has been obtained, the flash exposure confirmation lamp lights for about 3 sec. If the lamp does not light, the flash may have been insufficient, resulting in underexposure. In such a case, check that the pilot lamp is red, then move closer to the subject and take the picture again.
The preflash is fired to obtain an evaluative flash meter reading. The main flash illuminates the subject for the actual picture.

G Fill Flash

Fill flash can be used outdoors in daylight to supplement existing light. It can soften shadow areas of the subject or illuminate a backlit subject.
When fill flash is used, the flash exposure level is reduced automatically so that the subjects illumination by the flash balances well with the backgrounds ambient light. Instead of having a properly-exposed subject and an underexposed background, both the subject and background are exposed correctly for a natural-looking flash picture.

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2. Using Flash in Other Camera Modes
Flash photography is also automatic in the other picture-taking modes. In the Av (aperture-priority AE), Tv (shutter speed-priority AE), and M modes, the E-TTL autoflash system sets the flash exposure automatically. The camera sets the necessary shutter speed (in the Av mode), aperture (in the Tv mode), or flash output (in the M mode). Flash photography is as easy as normal AE picture-taking. Shutter Speed and Aperture Settings for Picture-Taking Modes
Camera Mode Av Tv M Shutter Speed Automatically set (30 sec. - 1/X sec.) Manually set (30 sec. - 1/X sec.) Manually set (bulb, 30 sec. - 1/X sec.) Flash Aperture Manually set Automatically set Manually set

Manually set: You set it yourself. Automatically set: Set automatically by the camera. 1/X sec.: Maximum sync speed. (see page 124) When the shutter button is pressed completely, a preflash fires to obtain an evaluative flash meter reading for setting the optimum output of the main flash. The backgrounds exposure is set with the shutter speed and aperture combination. If the camera is set to the mode (Full Auto), the shutter speed and aperture will be set in the same way as in the P mode (Program AE). If the DEP mode (depth-of-field AE) is used with the 550EX, it will be the same as using the P mode (Program AE).

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Using Flash in Other Camera Modes
(1) Av: Aperture-Priority AE and E-TTL Autoflash
This mode is effective for controlling the depth of field in your flash pictures. You can also obtain a balanced exposure between the subject and background. You set the aperture and the camera sets the shutter speed automatically to obtain a correct exposure for the background. The E-TTL autoflash system obtains the proper exposure based on the aperture you set. the 1 SetAv. cameras picture-taking mode to
that the distance is 4 Check the flash subjectdisplayed on within range the 550EXs LCD panel. icon is displayed 5 Check that the then take the picture.in the viewfinder,
If the top sync speed display blinks, the background will be overexposed. And if the 30 shutter speed display blinks, the background will be underexposed. In such cases, change the aperture until the shutter speed display stops blinking.

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G Balanced Flash Exposures
In low-light situations, the exposure level can be balanced between the subject and background by using a slow sync speed. You can obtain balanced flash exposures automatically by setting the cameras picture-taking mode to Av. The camera then sets the sync speed automatically to suit the background. Using a tripod is recommended to prevent camera shake.

Balanced flash exposure.

Flash exposure in the Full Auto mode.
To disable automatic balanced flash exposures, set the camera's picture-taking mode to M. You can then set the desired shutter speed and aperture manually. See page 30. Based on the shutter speed and aperture you set, the E-TTL autoflash system controls the flash exposure automatically. If you are using the Canon EF 135mm f/2.8 soft focus lens on your camera without a tripod, setting the shutter speed and aperture manually is most effective for obtaining soft-focus effects. Follow the procedure below. 1) Set an aperture near the maximum aperture. 2) Set the minimum shutter speed required to prevent camera shake. 3) Check that the flash has recharged, then take the picture.
To obtain balanced flash exposures in the Tv mode, set the shutter speed until the meter reading indicates a correct exposure. To obtain balanced flash exposures in the M mode, set the shutter speed and aperture until the meter reading indicates a correct exposure. Under flourescent lighting, the photo may have a greenish cast. And under tungsten lighting, the photo may have an orange cast.

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(2) Tv: Shutter Speed-Priority AE and E-TTL Autoflash
By selecting the shutter speed, you can obtain various effects with flash. You can set the shutter speed from 30 sec. to the top sync speed. The camera then sets the aperture automatically to obtain a correct exposure for the background. The E-TTL autoflash system controls the flash exposure based on the camera-selected aperture. the cameras picture-taking mode 1 SetTv and set the desired shutter to speed anywhere from 30 sec. to the top sync speed.
2 Set the. 550EXs flash mode to 3 Focus the subject. that the distance is 4 Check the flash subjectdisplayed on within range
the 550EXs LCD panel. icon is displayed 5 Check that the then take the picture.in the viewfinder,
If the aperture display blinks, the background may turn out overexposed or underexposed. In such a case, change the shutter speed until the aperture display stops blinking.

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(3) M: Manual Exposure and E-TTL Autoflash
In this mode, you set both the shutter speed and aperture. The E-TTL autoflash system controls the flash exposure based on the the aperture you set.
1 SetMthe cameras picture-taking mode to and set the desired aperture
and shutter speed anywhere from 30 sec. to the top sync speed. You can also use buLb.
If the flash ranges below apply, the icon will blink on the left end of the scale. Zoom Setting 17-28mm 35mm and longer Flash Range 0.5 m / 1.6 ft or shorter 0.7 m / 2.3 ft or shorter

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Advanced Flash Photography
This section explains advanced flash operations possible with the Speedlite 550EX. It contains the following: 1. High-Speed Sync (FP Flash) (page 32) 2. FE Lock (page 34) 3. Flash Exposure Compensation (page 36) 4. FEB (Flash Exposure Bracketing) (page 38) 5. Bounce Flash (page 40) 6. Close-Distance Flash Photography (page 43) 7. Manual Flash Mode (page 44) 8. Stroboscopic Flash (page 46) 9. Second-Curtain Synchronization (page 49) 10. Modeling Flash (page 50)
This section assumes that the 550EX is used with an EOS-3. Before proceeding, first turn on main switch on the EOS-3 and 550EX. Set the 550EXs wireless selector to OFF. For EOS-3 operations, refer to the EOS-3 Instructions.

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1. High-Speed Sync (FP Flash)

When you set the synchronization mode to high-speed sync (FP flash), the camera can synchronize with the 550EX at all shutter speeds. When highspeed sync has been set, is displayed in the viewfinder.
High-speed sync can be used in the E-TTL and M flash modes. High-speed sync is especially effective for fill-flash portraits in daylight since you can: (1) Obtain better background blur with a larger aperture. (2) Create a catchlight in the subjects eyes. (3) Soften shadows on the subjects face.
the 1 Select and camera's picture-taking mode the Speedlite's flash mode.
If you want to use a large aperture (smaller fnumber), set the Av or M mode.
2 Press the < >toand < > buttons simultaneously select on the

LCD panel.

Each time you press the < > and < > buttons simultaneously, the setting changes in the following loop. (Off)
3 Focus the subject. the subject 4 Check that displayed on is within the flash range the 550EXs

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High-Speed Sync (FP Flash)
5 Check that the icon is displayed in the viewfinder, then take the

picture.

With normal flash.

With high-speed sync.

With high-speed sync, the Guide No. changes depending on the shutter speed (see page 121). The faster the shutter speed, the shorter the flash range will be. Check the current flash range on the 550EXs LCD panel. To cancel high-speed sync, press the < > and < > buttons simultaneously twice so that the icon on the LCD panel turns off. When high-speed sync is used in the manual flash mode, the flash output ranges from 1/1 to 1/128.
If you use fill flash in the Av mode with high-speed sync, you can use a faster sync speed than the normal X-sync speed.

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2. FE Lock
You can use FE (flash exposure) lock with Type-A cameras. This is the flash version of AE lock. With FE lock, you use spot metering to obtain the correct flash exposure reading for a specific part of the subject.
FE lock works with E-TTL and high-speed sync (FP flash).
1 Select a picture-taking mode with the camera. 2 Focus the subject. metering 3 Aim the viewfinders spot subject to circle over the part of the
be metered. Then press the < > button on the camera. FE lock remains effective for 16 sec.
The 550EX fires a preflash to obtain an exposure reading. The reading is retained in memory. The focusing point linked to the FE lock lights in red. is displayed in the viewfinder for 0.5 sec. You can also press the < > button again to obtain an FE-lock reading for another part of the subject. To cancel FE lock, wait until 16 sec. elapse or press the < >, <AF>, or < > button on the camera.

When the flash heads zoom setting is automatic and the flash head is turned or tilted, the zoom setting is set automatically to 50mm. The zoom setting can also be set manually for bounce flash. If a manual zoom setting has been set, the zoom setting display does not change when the flash head is turned or tilted.

3 Focus the subject.

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Bounce Flash icon is displayed 4 Check that the then take the picture.in the viewfinder,
If the flash exposure confirmation lamp does not light after you take the picture, use a larger aperture (smaller f-number) and try again.

With bounce flash.

Without bounce flash.
Bounce the flash on a plain, white, reflective surface. If a colored surface is used, the picture may have a color cast.

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Bounce Flash

G Creating a Catchlight

A catchlight is a reflection of the flash in the subjects eyes. A catchlight in the eyes makes the subject look more lively. For portraits, you can easily create a catchlight with the 550EX. Tilt the flash head upward all the way by 90. Extend the built-in wide panel until it clicks in place as shown in the figure. To take a picture, follow the same procedure in "5. Bounce Flash."
Turning the flash head left or right will not produce a catchlight. Tilt the flash head up by 90 and use it in that position. The subject should not be farther than 1.5 meters / 4.9 ft from the camera.
If the wide panel is extended while the flash head is at the normal or 7 downward tilt position, the 550EXs LCD panel display will blink as a warning. Tilt the flash head upward by 90.

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6. Close-Distance Flash Photography
The flash head can be tilted downward by 7. This position enables the flash to better illuminate the lower part of a subject that is close to the camera. Press the < > button and tilt the flash head downward until it stops. The icon will blink on the LCD panel.
This flash head position is effective only for subjects 0.5 meter / 1.6 ft to 2 meters / 6.6 ft from the camera. The flash range will be displayed as shown in the left figure.

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7. Manual Flash Mode
In the manual flash mode, you can set the flash output from 1/1 (full) to 1/128 power in full-stop increments.
To prevent overheating and deterioration of the flash head, observe the following limits for continuous shooting with flash: (1) At 1/1 or 1/2 output: Max. 15 continuous flash shots. (2) At 1/4 or 1/8 output: Max. 20 continuous flash shots. (3) At 1/16 or 1/32 output: Max. 40 continuous flash shots.
the 1 SetAv orcameras picture-taking mode to M.
2 Press the 550EXs < and select M.

> button

Pressing the < > button changes the flash mode in the following loop:
The manual flash output display blinks.

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Manual Flash Mode > 4 Press the <flashor < > button to set the desired output.
Each time the button is pressed, the flash output changes by one stop.
the < > button 5 Press The manual flash output again. display will stop blinking and remain displayed.

6 Focus the subject.

When you press the shutter button halfway, focus will be achieved and the aperture and flash range (bar segment) will be displayed on the LCD panel.
7 Check the focusing distance on the lens.
flash range on the 8 Check thethe flash range doesLCD panel. If not match the focusing distance, change the aperture until it does match.
You can also change the flash output until the flash range matches the focusing distance.
icon is displayed 9 Check that the then take the picture.in the viewfinder,
If there is a large difference between the flash range and focusing distance, change the flash output or use a larger aperture until they match. To obtain a more precise flash exposure, use a hand-held flash meter.

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8. Stroboscopic Flash
With stroboscopic flash, a rapid series of flashes is fired. It can be used to record multiple images of a moving subject in a single photograph for later study. You can set the firing frequency (the number of flashes per sec. expressed as Hz) from 1 Hz to 199 Hz. The firing frequency can be set in 1-Hz increments from 1 Hz to 20 Hz, in 5-Hz increments from 25 Hz to 50 Hz, and in 10-Hz increments from 60 Hz to 199 Hz. Up to 100 flashes can be fired continuously. This maximum varies depending on the flash output and firing frequency. See Maximum Continuous Flashes on page 122.
G Setting the Firing Frequency, Flash Count, and Flash Output

1 Press the <. select

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Stroboscopic Flash > button to 2 Press the < frequency, flash select the firing count, or flash output display. When selected, the respective item blinks on the LCD panel to indicate that it can be altered. Pressing the < > button changes the blinking item in the following loop:

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(1) Av: Aperture-Priority AE and TTL Autoflash
This mode is effective for controlling the depth of field in your flash pictures. You can also obtain a balanced exposure between the subject and background. You set the aperture and the camera sets the shutter speed automatically to obtain a correct exposure for the background. The TTL autoflash system obtains the proper exposure based on the aperture you set. the 1 SetAv. cameras picture-taking mode to

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To disable automatic balanced flash exposures, set the cameras picture-taking mode to M. You can then set the desired shutter speed and aperture manually. See page 84. Based on the shutter speed and aperture you set, the TTL autoflash system controls the flash exposure automatically. If you are using the Canon EF 135mm f/2.8 soft focus lens on your camera without a tripod, setting the shutter speed and aperture manually is most effective for obtaining soft-focus effects. Follow the procedure below. 1) Set an aperture near the maximum aperture. 2) Set the minimum shutter speed required to prevent camera shake. 3) Check that the flash has recharged, then take the picture.
To obtain balanced flash exposures in the Tv mode, set the shutter speed until the meter reading indicates a correct exposure. To obtain balanced flash exposures in the M mode, set the shutter speed and aperture until the meter reading indicates a correct exposure.

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(2) Tv: Shutter Speed-Priority AE and TTL Autoflash
By selecting the shutter speed, you can obtain various effects with flash. You can set the shutter speed from 30 sec. to the top sync speed. The camera then sets the aperture automatically to obtain a correct exposure for the background. The TTL autoflash system controls the flash exposure based on the camera-selected aperture. the cameras picture-taking mode 1 SetTv and set the desired shutter to speed anywhere from 30 sec. to the top sync speed.
2 Set the 550EXs flash mode to. 3 Focus the subject. that the distance is 4 Check the flash subjectdisplayed on within range

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(3) M: Manual Exposure and TTL Autoflash
In this mode, you set both the shutter speed and aperture. The TTL autoflash system controls the flash exposure based on the aperture you set.

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This section explains advanced flash operations possible with the Speedlite 550EX. It contains the following: 1. 2. 3. 4. 5. 6. 7. Flash Exposure Compensation (page 86) FEB (Flash Exposure Bracketing) (page 88) Bounce Flash (page 90) Close-Distance Flash Photography (page 92) Manual Flash Mode (page 93) Stroboscopic Flash (page 95) Second-Curtain Synchronization (page 98)
This section assumes that the 550EX is used with an EOS-1N. Before proceeding, first turn on main switch on the EOS-1N and 550EX. Set the 550EXs wireless selector to OFF. For EOS-1N operations, refer to the EOS-1N Instructions.

The flash does not fire even when I press the shutter button completely.
If the contacts are dirty, use a clean cloth to wipe them.
Press the shutter button halfway or press the test firing button.
When I turn on the main switch, the entire display blinks.
Retract the wide panel completely.
The wide panel has been extended and the Speedlite is set for bounce flash. 5 When I press the shutter button halfway, the flash range bar segments blink. I installed new batteries in the external power source, but the flash still does not fire. The flash head has been tilted downward by 7.
Retract the wide panel. 20
Except for close-distance subjects, do not tilt the flash head downward. Even when using an external power source, be sure to have good batteries in the 550EX. Replace the batteries in the 550EX with new ones.
Batteries have not been installed in the 550EX itself. Or, the batteries in the 550EX are exhausted. The batteries in the 550EX are exhausted. Disconnect the external power source and turn on the 550EX. If the pilot lamp does not light within 30 sec., the 550EXs batteries are exhausted.
I installed new batteries in my external power source and connected it to the Speedlite. When I turned on the power switch, the flash head zoomed automatically. Or the LCD panel display went out.
The flash picture looks dark toward the bottom.
The subject was too close to the camera.
If the subject is 2 meters or closer, tilt the flash head downward by 7.

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No. 9 Problem The subject was toward the edge of the picture and it came out overexposed. Probable Cause The subject was not correctly exposed with the flash. Solution With an EOS camera having multiple focusing points, select a focusing point which covers the subject and then compose the shot before taking the picture. With an EOS camera having only one focusing point, set a suitable exposure compensation amount on the minus side. Position yourself or the subject so that the flashs reflection in the window does not enter the picture. Or set exposure compensation on the plus side. Set exposure compensation on the minus side. Page
The subject was in front of a window and the subjects face turned out dark.
The flashs reflection in the window caused the underexposure.
A group picture of people wearing black clothing had overexposed faces.
The Speedlite tried to obtain a correct exposure for the black clothing which has low reflectance. The flash heads zoom setting that you set manually gave inadequate flash coverage for the lens focal length. Flash exposure compensation was still in effect. Since the camera was set to the Av mode and the scene was dark, a slow shutter speed was set automatically. During the slow exposure, camera shake caused the blurry photograph. The slave units wireless selector is not set to The slave unit is not within the master units wireless transmission range.

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Flash-ready indication: (1) Red pilot lamp indicates normal flash ready. (2) Yellow pilot lamp indicates quick flash ready. AF-assist beam linkage and range: Linked to area AF (45 focusing points), effective from approx. 0.6 to 10 meters / 2 to 33 feet at the center and 0.6 to 5 meters / 2 to 16 feet along the periphery (in total darkness). Wireless functions Transmission system: Optical pulse transmission Configuration: Camera, master unit, and slave unit(s) Wireless switchover: With wireless selector Wireless selector positions: OFF, Master, Slave Channels: 4 [Master unit] Transmission angle: Horizontal: Approx. 80 / Vertical: Approx. 60 (At zoom setting) (Manual zooming of flash head also enabled) Transmission range: Indoors: Approx. 12 to 15 meters / 39.3 to 49.2 feet Outdoors: Approx. 8 to 10 meters / 26.2 to 32.8 feet No. of transmissions: Approx. 1500 (without master unit firing) Controllable slaves: A, B, C (3 groups) Flash control: (1) E-TTL autoflash (with Type-A cameras) High-speed sync (FP flash) / FE lock / flash exposure compensation / FEB / flash ratio control (2) Manual flash (with Type A and B cameras) (3) Stroboscopic flash (with Type A and B cameras) Flash ratio control: A:B = 8:1 to 1:1 or 1:1 to 1:8 (In thirteen 1/2-stop increments) (For C, flash exposure compensation can be set up to 3 stops in 1/3 or 1/2-stop increments.) Master flash: ON/OFF possible (When ON, automatic set as slave unit A.) [Slave unit] Reception angle: Horizontal: Approx. 80 / Vertical: Approx. 80 Flash coverage: Set automatically to (Manual zooming of flash head also enabled) Flash-ready indication: AF-assist beam emitter blinks Flash modes: (1) Controlled automatically by master unit. (2) Manual flash and stroboscopic flash settable independently from master unit. Flash exposure compensation: Settable individually with each slave unit up to 3 stops in 1/3- or 1/2-stop increments. Slave Operation Confirmation: Enabled with master unit's test firing button.

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Slave unit SE mode cancellation: While the slave units SE mode is in effect, the slave unit turns on when a flash is fired. The slave unit's SE mode can be canceled by the following wireless operations: (1) When the master units test firing button is pressed. (2) When the cameras FE lock button is pressed. Internal power sources: (1) Size-AA alkaline batteries 4 (2) Size-AA nickel-hydride batteries 4 * Size-AA lithium batteries 4 (1) Compact Battery Pack CP-E2 Size-AA alkaline batteries 6 Size-AA nickel-hydride batteries 6 (2) Transistor Pack E Battery Magazine TP with size-C alkaline batteries 6 Ni-Cd Pack TP (NR-SC Ni-Cd batteries 6 in sealed pack) With the power switch set to SE, the Speedlite enters the SE mode as follows: On-camera master unit enters the SE mode after 90 sec. of non-use. Slave unit enters SE mode after 60 min. (or 10 min. with CF-4) of non-use.

Wireless

*1 With Custom Function CF-3-1. *2 Only one slave group can be controlled. *3 For bulb exposures with the EOS 700, the aperture f/5.6.

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G: Available. Wireless Flash M/MULTI G G G G G G G *3 G G G G G G G G G G G G G G G G G G G FP Flash G G G G G G G G G G G FE Lock G G G G G G G G G G G Flash Exposure Compensation w/550EX G G G G G *4 G G G G G G G G G G G G G G G G G G G w/camera G G G G G G G G G FEB G G G G G *4 G G G G G G G G G G G G G G G G G G G Flash Ratio Control G G G G G
: Not available. 2nd-Curtain Sync G G G G G G G *4 G G G G G G G G G G G G G G G G G G G

s Flash

Modeling Flash G G G G G
*4 Enabled in shutter-speed AE mode.

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This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Do not make any changes or modifications to the equipment unless otherwise specified in the instructions. If such changes or modifications should be made, you could be required to stop operation of the equipment. This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Consult the dealer or an experienced radio/TV technician for help.
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the interference-causing equipment standard entitled Digital Apparatus, ICES-003 of the Industry Canada.