FLASH REVIEW

Camera Flash / Speedlight: Canon 550EX Speedlite Flash Unit Flashgun
Model Name: Canon 550EX Speedlite Flash Unit Flashgun
Image:Canon 550EX Speedlite Flash Unit Flashgun
Fivercam Price (used) UK
eBay Price (used) UK
Release Date
Strenght / Power
Guide Number (ISO100, meters) Flash Specs Normal Mode (ISO 100)High-Speed Sync (FP Flash, ISO 100)
Power Level Switching (Vari-power Range)
Head & Coverage
Bounce (Up-Down) Head Movement
Swivel (Rotation) Head movement
Focal Length Coverage Flash Specs 24mm (APS-C 15mm)
Auto Zoom Head Flash Specs
Flash Related Functions
Flash Durations Flash Specs
Flash Modes(TTL) Flash Specs E-TTL II/E-TTL
Flash Exposure Compensation / Correction Flash Specs
Secondary Illumination Flash Specs
Wireles Flash
Wireless Operation Flash Specs
Wireless Groups Flash Specs
Wireless Channels4
Remote Timing Modes3
Other Features
MountHot-shoe mount flash
Off Camera Terminal / External Connectors
Included Accessories
Other Functions
Power Source & Recycle Time
Power Source - Batterry
External Power
Minimum Recycle Time (Charging time between shooting) Flash Specs
Battery Life Flash SpecsApprox. 100-700 (flashes per set of batteries)
Dimensions & Weight
Dimensions3.1 x 5.4 x 4.4" (80 x 138 x 112mm)
Weight14.2 oz (405g)
More Details or Support Website: Link
Item 1
Fivercam Wiki information:

There are three ways to trigger off-camera flash units wirelessly: via infrared, radio signals or a hybrid method that involves both infrared and radio. The infrared system works like the TV remote; there need to be a direct line of sight for the signal to reach the destination. The radio signal has no line-of-sight limitations, but comes at a rather high cost. The hybrid system simply takes the infrared signal from the commander, converts it over to radio and then converts it back to infrared on slave units.

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