Camera Flash / Speedlight: Canon 90EX Speedlite Flash Unit Flashgun
Model Name: Canon 90EX Speedlite Flash Unit Flashgun
Image:Canon 90EX Speedlite Flash Unit Flashgun
Fivercam Price (used) UK
eBay Price (used) UK
Release Date
Strenght / Power
Guide Number (ISO100, meters) Flash Specs 30' / 9.14 m ISO 100
Power Level Switching (Vari-power Range)
Head & Coverage
Bounce (Up-Down) Head MovementNone
Swivel (Rotation) Head movementNone
Focal Length Coverage Flash Specs 84° - mm (Full Frame)
Auto Zoom Head Flash Specs
Flash Related Functions
Flash Durations Flash Specs
Flash Modes(TTL) Flash Specs
Flash Exposure Compensation / Correction Flash Specs -3 EV to +3 EV (in 1/3 EV steps) In-camera control
Secondary Illumination Flash Specs
Wireles Flash
Wireless Operation Flash Specs Method: Optical Pulse Distance: Up to 22.97' / 7 m
Wireless Groups Flash Specs 4
Wireless Channels3
Remote Timing Modes
Other Features
MountHot-shoe mount flash
Off Camera Terminal / External Connectors
Included Accessories
Other Functions
Power Source & Recycle Time
Power Source - Batterry2 x AAA Alkaline, Lithium, Rechargeable NiMH Batteries
External Power
Minimum Recycle Time (Charging time between shooting) Flash Specs Approximately 0.1 to 5.5 Seconds
Battery Life Flash SpecsApprox. 100 (flashes per set of batteries)
Dimensions & Weight
Dimensions1.7 x 2.0 x 2.6" / 44.3 x 52.0 x 65.0 mm
Weight1.76 oz / 50 g
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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