The main light-metering technologies are known as A-TTL, E-TTL, and E-TTL II.
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The pre-flash occurs immediately before the main flash (except when using the camera / flash in 2nd curtain synch mode) and is barely perceptible, although it can be seen if you watch carefully for it.
The pre-flash may cause undesirable reactions from animate objects - e.g.
This gives the photographer the flexibility to lock focus and recompose the scene without fooling the flash metering system.
'Hotspots' (areas of high reflectance) that would normally throw off the flash metering system are also ignored in the calculation.
The Speedlite name is also used by Ricoh for its unrelated product line of flash units, such as the Ricoh Speedlite 202.
The brand names are intended to indicate that strobe flashes produce much shorter and more intense bursts of light than earlier photographic lighting systems, such as flashbulbs, or the continuous lighting used in some studio situations.Unlike TTL and A-TTL metering, which use a dedicated flash metering sensor mounted in the base of the mirror box, E-TTL uses the same evaluative metering sensor used for ambient metering.Like TTL (and like the actual flash metering, but not the pre-flash, of A-TTL), the sensor is internal to the camera and takes its exposure via the lens so any filters added to the lens will also affect the E-TTL readings giving more accurate exposure information to the camera.Speedlite is the trade name for Canon's line of external flashes for use with their EOS line of cameras.It is similar but not to be confused with Nikon Corporation's "Speedlight" brand for their flashes.E-TTL II is a software improvement on E-TTL and is now a standard in all EOS cameras introduced with or after the Canon EOS-1D Mark II in 2004.