Pentax AF540FGZ II Flash


  • All Weather Construction
  • Compatible with Pentax P-TTL
  • Guide Number: 177′ at ISO 100 and 85mm
  • Zoom Range: 24-85mm (20mm with Panel)
  • Tilts from -10 to 90°
  • Rotates 135° Left & 180° Right
  • Wireless Master/Slave TTL Functionality
  • LED Light with 5 Output Settings
  • Multi Flash Mode & Contrast Control Sync
  • Slow, High-Speed, 1st & 2nd Curtain Sync

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Complete your durable, rugged All Weather camera setup with the P-TTL capable AF540FGZ II Flash from Pentax which features 28 seals, including the hot shoe, that enable a reliable weather-resistant digital imaging system. This unit has a guide number of 177′ at ISO 100 and 85mm along with a 35mm equivalent zoom range of 24-85mm, though the auto zoom function is compatible with smaller format Q-series mirrorless cameras, APS-C DSLRs, and medium format 645-series digital cameras. Also, with the use of a built-in diffusion panel the coverage can be extended to 20mm. Another benefit of this flash is tilt from -10 to 90° and rotation 135° to the left and 180° to the right for complete bounce functionality.

The AF540FGZ II has wireless master and slave TTL capabilities with access to 4 channels. It utilizes an optical pulse to transmit information and trigger flash units up to 13.1′ away. Also, this unit can be set as a master, control, or slave unit and has access to a contrast control sync setting that enables the adjustment of the output of multiple flashes from a single unit.

An added feature for this flash is a constant LED light with 5 output settings for use during video, as an AF assist light, or as simply another light for your subject. Other settings include a multi-flash mode for stroboscopic photography as well as slow, high-speed, first and second curtain sync. Additionally, the AF540FGZ II runs on 4 AA batteries with a recycle time of 2.6-26.2 seconds and it comes with a case and stand.

  • Creative control modes include first-curtain sync, second-curtain sync, high-speed sync, and contrast control
  • Rotates from 180° right to 135° left with a lock at 0° and click stops
    Right: 180°, 150°, 120°, 90°, 60°, and 30°
    Left: 135°, 90°, 60°, and 30°
  • Tilts from +90° to -10° with stops at +90°, +75°, +60°, 45°, 30°, 0°, and -10°
  • Recycle time: NiMH/3 sec – Alkaline & Lithium/5 sec
  • Flash head automatically controls zoom from 24mm-85mm (full-frame) with compatible cameras and autofocus lenses
  • Wide-angle panel pulls out of flash head to expand coverage to a 20mm angle of view in full-frame format
  • Multi-flash mode for up to 100 flashes
  • Effective range of 2.6-26.2′
  • AF-assist beam for focusing under low light or low-contrast conditions
  • Daylight balanced flash for use outside without the need for gels or filters
  • Auto power off after 3 minutes of non-operation or after 1 hour while in wireless mode
  • LCD panel is backlit for use in poor lighting conditions
  • Runs on 4 alkaline, lithium, or Ni-MH AA batteries
Package Weight 1.25 lbs
Package Dimensions 8.0 x 4.1 x 2.4 in
Dimensions (WxHxD)

3.0 x 4.4 x 4.3″ / 76.0 x 113.0 x 108.0 mm

Flash-ready Indicator



20 mm – 85 mm (Full frame)

Angle of Coverage

31° – 78° Horizontal Wide-Angle Adapter: 98° Horizontal 23° – 60° Vertical Wide-Angle Adapter: 85° Vertical


1/1 – 1/256



Recycle Time

Approximately 3 – 5 seconds

Power Source

4x AA Alkaline, Lithium, Rechargeable NiMH Batteries

Wireless Communication Channels

4 Channels


-4 EV to +2 EV (in 1/3 and 1/2 EV steps)

Flash Duration

1/1200 – 1/20000 sec

Guide No.

177.17′ (54 m) ISO100

Wireless Operation

Method: Optical pulse Distance: Up to 13.12′ / 4.0 m

Package Weight

1.25 lb

Distance Range

2.62 to 26.25′ (0.8 to 8.0 m) at f/5.6

Bounce Head

+90° to -10°

Swivel Head


Zoom Head

Full frame: 24 mm – 85 mm

Box Dimensions (LxWxH)

8.0 x 4.1 x 2.4″


12.35 oz / 350 g


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