Canon EOS Rebel T2i EF-S 18-55mm IS Kit Broşür - Sayfa 20

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Canon EOS Rebel T2i EF-S 18-55mm IS Kit Broşür

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 subject, yet operation is remark-

ably simple. Whether you're an amateur or

an expert, Canon Speedlites make it easy to

obtain professional results.

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, 270EX, 220EX,

MT-24EX, or MR-14EX in combination with a

compatible camera.

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.

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 50D

Yes

Not Possible

†

EOS 40D

Yes

Not Possible

†

EOS 30D

Yes

Not Possible

†

EOS Rebel T2i / T1i / XSi / XS

Yes

Not Possible

†

EOS Digital Rebel XTi / XT

Yes

Not Possible

EOS-1v / EOS-3

Yes

4-point / 3-zone

EOS ELAN 7

Yes

4-point / 3-zone

EOS Rebel T2 / T2 Date

Yes

Not Possible

EOS Rebel K2 / K2 Date

Yes

4-point / 3-zone

E-TTL / E-TTL II

A-TTL

TTL

Manual

580EX II

Yes

††

Yes

†††

Yes

430EX II

Yes

††

Yes

270EX

Yes

††

220EX

Yes

††

Yes

†††

MR-14EX

Yes

††

Yes

†††

Yes

MT-24EX

Yes

††

Yes

†††

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.

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

Speedlite's preflash fires when the camera's AE

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

Lock button is depressed, storing a Spot meter

metering when the shutter button is pressed.

reading of flash and ambient lighting data for up

Next, a preflash is fired and the metering sensor

to 16 seconds. This provides enough time to not

takes readings. The ambient and preflash readings

only recompose the shot, but also alter the ambient

are compared. The metering areas having small

light exposure for maximum creative control. FE

differences are selected as the main flash exposure

Lock is extremely useful when you wish to recom-

areas. Areas with large discrepancies between

pose after focus lock or to place the main subject

ambient and preflash readings are excluded or

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

down-weighted because they are assumed to

focusing points. It can also eliminate potential

contain a highly reflective subject, or the subject

exposure errors caused by unwanted reflections

is not in that part of the frame—an assumption

from surfaces like windows or mirrors.

validated by distance information. The algorithm

thus helps avoid chronic underexposure problems

in such situations. These readings are weighted,

preflashing the subject with the FE Lock button,

averaged, and compared with the ambient light

ambient exposure can be adjusted by turning the

reading and the main flash output is then set

Quick Control Dial. The ambient exposure level is

and stored in memory.

displayed on the exposure level scale in the

viewfinder and on the external LCD panel.

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

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

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 (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.

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

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.

***

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

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

an EX-series Speedlite to synchronize flash at shut-

ter speeds faster than the camera's normal maximum

sync speed. Even in bright daylight, for example,

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

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

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

and is available in all AE modes plus Manual.

****

This setting adjusts flash output without changing

** After

the shutter speed or aperture. It's a particularly

effective way to fine-tune the balance between

foreground and background exposure for fill flash

shots, but it can also be used to compensate for

extremely bright or dark tones in the subject.

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 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).