Canon EOS 400D User Manual download pdf (Page 10)

E-TTL II: Smarter ﬂash performance

Canon’s high-end digital SLRs employ E-TTL II, the most advanced ﬂash metering

technology, to solve problems encountered by photographers. Occasionally, if you lock

focus and recompose your shot, this could result in a non-optimal exposure with previous

systems. E-TTL II remedies this by ignoring the active focusing point, considering distance

information and evaluating pre-ﬂash information immediately before the exposure occurs.

Sometimes in ﬂash photography, mirror-like objects in the image cause the sensor to

knows to ignore those levels, resulting in the correct exposure. This feature is useful when

shooting a subject with a highly reﬂective object in the background, or if the subject itself

is highly reﬂective. Metered areas with large discrepancies between ambient and pre-

ﬂash readings are excluded or down-weighted because they are assumed to contain a

highly reﬂective subject. These readings are weighted, averaged and compared with the

ambient light reading and the main ﬂash output is then set and stored in memory, ensuring

consistent ﬂash output through a number of shots.

Speedlite 580EX

Approx. 25% faster recycling time compared to previous 550EX.

Superior evenness of exposure, centre to corner of frame.

Slightly higher max. guide number at 105mm setting (GN 58 meters at

ISO 100).

Auto conversion of flash coverage with compatible digital SLRs.

White Balance info communicated instantly to compatible digital SLRs.

Full swivel, 180° in either direction (first TTL flash with this ability).

AF-assist beam now compatible with all AF points on every EOS SLR.

Select ‘Dial’ for easy inputs and user control.

Speedlite 430EX

Significantly greater user control via new LCD panel on rear of flash.

Wide-angle pull-down panel covers 14mm lens (on a full-frame camera).

Slightly higher max. guide number at 105mm setting (GN 43 meters at

ISO 100).

Auto conversion of flash zoom coverage with compatible digital SLRs.

White Balance info communicated instantly to compatible digital SLRs.

Bounce upward to 90°; swivel right (to 90°) and left (180°).

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Canon EOS 400D User Manual Page 10