High-speed sync
Wireless multiple flash
Slow sync
FE lock
Versatile Functions
Macro Shooting
Lighting Techniques
Product Lineup
Flash Terminology
Professional lighting control is no longer reserved for professionals.
image:Speedlite 580EX
Speedlite 580EX     EF35mm f/1.4L USM, 1/200, f/5.6
Sample photo analysis
image:Evaluative metering (no flash)
Evaluative metering (no flash)
image:Spot metering (no flash)
Spot metering (no flash)
In the photo on the right, the spot metering function was used to determine the exposure. The resulting image was brightly lit, but lacked the vivid detail the photographer was striving to attain. Moreover, the image failed to capture the atmosphere of the old town in the background, which was overexposed.

The main photograph was captured by taking advantage of the automatic flash exposure control of E-TTL II. This intelligent feature eliminated the dramatic exposure gap and captured both the angel and piazza with a clarity that matched the photographer's aspirations.
Automatic functions replace sophisticated lighting techniques.
Your range of photographic expression expands exponentially when using an external flash unit as the main or auxiliary light source. For example, subjects can easily be captured against reflective backgrounds at the ideal exposure. Or you can highlight subject details without adjusting exposure to compensate for the background.

Fully automatic functions available in EX Series Speedlite flash units provide all the benefits of professional exposure and light control techniques. When mounted on an EOS camera, a Speedlite automatically receives information such as the lens focal length, exposure control mode and aperture. It then makes adjustments accordingly, working together with the camera as an integrated unit to achieve the most natural possible exposure. When photographers use a Speedlite, they reap the rewards of sophisticated flash photography with the press of a shutter button.
image:use flash
image:no flash
E-TTL II strikes a natural balance between the subject and background.
E-TTL II is Canon's latest proprietary automatic flash exposure control system. By employing multiple metering zones to measure both ambient light and preflash, then comparing the two and taking metering distances into account, this sophisticated system automatically adjusts the flash level to achieve natural reproduction with ideal exposure of both the background and subject.

In various shooting situations, even when the background is highly reflective, E-TTL II can use distance information from the lens to eliminate underexposure and achieve optimal automatic flash exposure control.
E-TTL II autoflash system operation flow
Color temperature compensation ensures faithful color reproduction.
When an EX Series Speedlite is mounted on an EOS DIGITAL camera, it automatically informs the camera of the color temperature of its illumination. This enables the camera to calculate white balance with extreme accuracy.

* White balance must be set to "automatic" or "flash use" mode.
Light distribution is optimized depending on the camera's image sensor size.
The angle of view of an EOS DIGITAL camera is different depending on the size of its image sensor (APS-C, APS-H, or 35mm full-size), regardless of the focal length of the lens being used. This factor is taken into account by EX Series Speedlites, which automatically adjust the flash zoom mechanism depending on your camera's image sensor size to deliver an ideal flash angle for the effective angle of view. Since only necessary areas of the scene are illuminated, Speedlites are especially efficient at conserving energy.
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