Camera Flash / Speedlight: Pentax AF 540 FGZ II Flashgun
Model Name: Pentax AF 540 FGZ II Flashgun
Image:Pentax AF 540 FGZ II Flashgun
Fivercam Price (used) UK
eBay Price (used) UK
Release Date2011
Strenght / Power
Guide Number (ISO100, meters) Flash Specs 54/177, ISO 100 m/ft (177' at ISO 100 and 85mm)
Power Level Switching (Vari-power Range)From full power to 1/128
Head & Coverage
Bounce (Up-Down) Head Movementfrom +90° to -10°
Swivel (Rotation) Head movementfrom 180° right to 135° left
Focal Length Coverage Flash Specs Cover angles of view from 24mm to 85mm lenses. Built-in wide-angle panel that slides out to cover 20mm angle of view (in 35mm format)
Auto Zoom Head Flash Specs
Flash Related Functions
Flash Durations Flash Specs 1/20,000s to 1/1,200
Flash Modes(TTL) Flash Specs P-TTL auto, Manual (9 power settings), Multi, Wireless P-TTL, Wireless Manual
Flash Exposure Compensation / Correction Flash Specs 1/3~stop increments up to ~3 stops
Secondary Illumination Flash Specs
Wireles Flash
Wireless Operation Flash Specs Wireless Master/Slave TTL Functionality
Wireless Groups Flash Specs
Wireless Channels4
Remote Timing Modes
Other Features
MountHot-shoe mount flash
Off Camera Terminal / External Connectors
Included Accessories
Other Functions
Power Source & Recycle Time
Power Source - Batterry4 alkaline, lithium, or Ni-MH AA batteries
External Power
Minimum Recycle Time (Charging time between shooting) Flash Specs Alkaline: 5 s, Ni-MH: 3 s, Lithium: 5 s Read more at: https://www.pentaxforums.com/accessoryreviews/pentax-af-540fgz-ii.html#ixzz85ga9PdAR
Battery Life Flash Specs
Dimensions & Weight
Dimensions76 x 113 x 108mm
Weight350g (without batteries)
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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