Canon EOS Rebel T3i Brochure - Page 23

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SPEEDLITE TECHNOLOGY

Integral to the EOS System, Canon Speedlites

are the ideal flash source for EOS SLR cameras.

They are technologically advanced to provide

perfect exposure and illumination with just

about any subj ect, yet operation is remarkably

simple. Whether you're an amateur or an

expert, Canon Speedlites make it easy to

obtain professional results.

Sophisticated Flash Control Modes

E-TTL—In E-TTL (Evaluative Through-The-Lens) flash

exposure control mode, meter readings are taken

through the lens, but not off the focal plane. Using

a preflash fired after the shutter button has been

fully depressed—but before the camera's reflex

mirror goes up—E-TTL uses the camera's Evaluative

metering sensor to compare the ambient light

values with the light reflected from the subject

by the preflash. The camera then calculates and

stores the flash output required for optimum

exposure of the main subject (as identified by

the AF point) and the background. E-TTL requires

the use of EX-series dedicated Speedlites

such as the 580EX II, 430EX II, 320EX, 270EX II,

220EX, MT-24EX, or MR-14EX in combination

with a compatible camera.

E-TTL II—Available on Canon's EOS digital SLR

cameras, E-TTL II incorporates distance information

from compatible EF lenses (see page 30 for

details) for more versatile flash exposure control.

E-TTL II minimizes underexposure that can occur

with straight reflections by ignoring sensor areas

that report abnormally high levels. This feature

is useful when shooting a subject with a highly

reflective object in the background, or if the

subject itself is highly reflective. In addition,

because distance information is used in calcu-

lating the flash output level, E-TTL II prevents

overexposure when photographers lock focus

and recompose.

SLR Compatibility

Camera Model

E-TTL

E-TTL II

A-TTL / TTL

EOS-1Ds Mark III

Yes

†

Not Possible

EOS-1D Mark IV

Yes

†

Not Possible

EOS 5D Mark II

Yes

†

Not Possible

EOS 7D

Yes

†

Not Possible

EOS 60D

Yes

†

Not Possible

EOS 50D

Yes

†

Not Possible

EOS 40D

Yes

†

Not Possible

reading of flash and ambient lighting data for up

EOS 30D

Yes

†

Not Possible

EOS Rebel T3i / T3 / T2i / T1i / XSi / XS

Yes

†

Not Possible

to 16 seconds. This provides enough time to not

EOS Digital Rebel XTi / XT

Yes

†

Not Possible

EOS-1v / EOS-3

Yes

4-point / 3-zone

only recompose the shot, but also alter the ambient

EOS ELAN 7

Yes

4-point / 3-zone

light exposure for maximum creative control. FE

EOS Rebel T2 / T2 Date

Yes

Not Possible

EOS Rebel K2 / K2 Date

Yes

4-point / 3-zone

Lock is extremely useful when you wish to recom-

Speedlite Compatibility

E-TTL / E-TTL II

A-TTL

TTL

Manual

pose after focus lock or to place the main subject

580EX II

Yes

††

†††

in a part of the frame not covered by one of the

430EX II

Yes

††

320EX

Yes

††

focusing points. It can also eliminate potential

270EX II

Yes

††

270EX II

Yes

††

exposure errors caused by unwanted reflections

220EX

Yes

††

†††

MR-14EX

Yes

††

†††

from surfaces like windows or mirrors.

MT-24EX

Yes

††

†††

† Not Linked to AF point. †† Requires EOS body that supports E-TTL and E-TTL

II respectively. ††† Defaults to TTL in all conditions except direct flash in the

camera's Program mode.

Adjusting Ambient Exposure in FE Lock**—After

preflashing the subject with the FE Lock button,

For example, with the EOS-1D Mark IV, the ambient

ambient exposure can be adjusted by turning the

light is first measured using the camera's 63-zone

Quick Control Dial. The ambient exposure level is

metering when the shutter button is pressed.

displayed on the exposure level scale in the

Next, a preflash is fired and the metering sensor

viewfinder and on the external LCD panel.

takes readings. The ambient and preflash readings

FP Mode***

are compared. The metering areas having small

differences are selected as the main flash exposure

FP (focal-plane) flash, or High-speed Sync, enables

areas. Areas with large discrepancies between

E-TTL and E-TTL II compatible cameras equipped with

ambient and preflash readings are excluded or

an EX-series Speedlite to synchronize flash at shutter

down-weighted because they are assumed to

speeds faster than the camera's normal maximum

contain a highly reflective subject, or the subject

sync speed. Even in bright daylight, for example,

is not in that part of the frame—an assumption

a fast lens can be used at a wide aperture to reduce

validated by distance information. The algorithm

depth-of-field and emphasize the subject. FP flash

thus helps avoid chronic underexposure problems

can be combined with E-TTL, E-TTL II, or FE Lock,

in such situations. These readings are weighted,

and is available in all AE modes plus Manual.

averaged, and compared with the ambient light

Flash Exposure Compensation****

reading and the main flash output is then set

and stored in memory.

This setting adjusts flash output without changing

the shutter speed or aperture. It's a particularly

The E-TTL II, in effect, captures the subject as a

effective way to fine-tune the balance between

"plane" and not as a "point." As a result, EOS

foreground and background exposure for fill flash

SLR cameras can help deliver consistent flash

exposures even if the subject contains various

colors and levels of reflection. The camera also

allows the user to select an averaged metering

pattern through custom function settings.

TTL*—TTL (Through-The-Lens) is the standard

flash exposure control mode used by the built-in

flash units that come with some 35mm EOS film

cameras. Unlike E-TTL or E-TTL II, TTL reads flash

illumination reflected from the film during the

exposure. When the camera is set to Program AE

mode, TTL flash sets an aperture based on the

ambient light level.

Flash Exposure Lock (FE Lock)

FE Lock adds Auto Exposure lock and Spot metering

functions when shooting with EX-series Speedlites

and E-TTL compatible EOS cameras. The EX-series

Speedlite's preflash fires when the camera's AE

Lock button is depressed, storing a Spot meter

Taken with MT-24EX and EOS-1v HS

*ATTL and TTL are not compatible with digital SLR cameras. See lens chart for a listing of lenses that supply distance information. **Ambient exposure cannot be adjusted when the camera is set to Bulb mode or in

low-light situations when the camera is set to Program AE or A-DEP. ***Unlike conventional electronic flash, FP flash output (guide number) decreases as shutter speed increases above normal X-sync speed. ****Flash

exposure compensation can be set with most current Speedlites, and it can also be set with all current EOS cameras other than the EOS Rebel series and EOS Digital Rebel.

SPEEDLITES

High-Speed Sync — EF 135mm f/2.0L USM lens •f/2 •1/750 sec.

shots, but it can also be used to compensate for

extremely bright or dark tones in the subject.

Second-Curtain Sync

Instead of firing the instant the shutter opens,

Second-Curtain Sync fires the flash at the end of

the exposure, allowing streaks of light to flow

naturally behind a moving subject. This creative

flash mode is most effective with slower shutter

speeds and subjects with light sources, such as

the headlights of a moving car.

Stroboscopic Flash

Stroboscopic flash is a series of flashes fired in

rapid succession during a single exposure. With

stroboscopic flash, multiple images of a moving

subject appear in the photograph. Using this

mode, you can analyze a golf swing or record the

shattering of a windowpane. (Available with

Speedlite 580EX II, Macro Ring Lite MR-14EX

and Macro Twin Lite MT-24EX, the built-in flash

of the EOS 7D).

LED Light

In a first for Canon

Speedlite flashes, the

320EX features a

bright, built-in LED light

for illumination when

shooting video or for

use as a modelling light. With fully charged

AA batteries, the LED light can last for up to

four hours of continuous use.

Flash Release Function

Select Speedlite models include a convenient

feature that enables photographers to release

the camera shutter from the remote flash wire-

lessly with a 2-second delay. With EOS DSLR

cameras that provide a master function with

remote reception mode, this feature makes it

possible to reposition the flash with complete

freedom – even out of the camera's line-of-sight

and at some distance from the camera.