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Pentax AF-540 FGZII

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Product Description

  • Weather resistant All Weather (AW) construction pairs perfectly with PENTAX WR digital SLRs.
  • Guide Number 178 at ISO 100/ft (54 at ISO 100/m)
  • LED constant light source for video and long exposure photography
  • Fast battery recycle time of 5 sec.

Designed to be tougher, smaller and lighter, this hot shoe mounted, bounce-and-swivel, auto-zoom flash provides a variety of advanced flash applications, including P-TTL auto flash, high-speed synchronization and wireless P-TTL auto flash with PENTAX digital SLR cameras, and is now equipped with the PENTAX-original weather sealed construction and an LED light for a constant ambient source for shooting movies and long exposure stills. Enjoy vertical and horizontal bounce flash, and seriously enhanced battery life.

  • With 28 dependable weather seals, its All Weather construction allows for worry-free use in demanding outdoor settings that include rain, fog and dust.

  •  A high-intensity fixed LED light creates a constant ambient source, ideal for close-distance video recording, as well as long exposure photography. It also functions as a catch light for portraiture and as an autofocus assist light in the dark.

  •  P-TTL mode with pre-flash allows for more accurate strobe photography.

  •  Never miss the moment with exceptionally fast battery recharge time of 5 seconds.

  •  High speed on camera and high speed wireless flash is available in P-TTL modes.

  •  Its luminous LCD display shows the effective range of the flash.

  •  Built-in wide-angle panel that slides out to cover 20mm angle of view (in the 35mm format).

  •  Guide Number 178 at ISO 100/ft (54 at ISO 100/m) for increased range and versatile flash performance.

  •  Designed to be tougher, smaller and lighter, this strobe is 30% smaller in volume than its predecessor.

  •  Bounce Flash Function is adjustable to angles of -10 to 90 degrees vertically and up to 180 degrees horizontally.

  •  With user-friendly function settings, customize and control flash operations with as many as nine pre-settings, including the on/off of the catch-light function.

  •  Flash exposure compensation through a simple control dial.

  •  Power-zoom flash to cover angles of view from 24mm to 85mm lenses (in the 35mm format).

  •  Multi flash emission function available.



Flash Modes

P-TTL auto, manual, multi, wireless (P-TTL/Manual)

Bounce Head

Vertical and horizontal bounce possible, click stops provided, lock provided at 0°.
Rightward: 0°, 30°, 60°, 90°, 120°, 150°, 180°
Leftward: 0°, 30°, 60°, 90°, 135°
Upward: 0°, 30°, 45°, 60°, 75°, 90°
Downward: 0°, -10°

Zoom Head

Auto zoom enabled with autofocus compatible camera and lens combination.

Color Temp



76 mm (W) × 113 mm (H) × 108 mm (T) (3.0'' × 4.4'' × 4.2'')


LCD panel illumination button illuminates the LCD panel for about 10 seconds or press the button again to turn it off.

Guide Number

Maximum 54 (ISO 100/m)
Approx. 0.8 m - 8.0 m (Guide No. 45, ISO 100, F/5.6)

Interval Battery Life

Automatic power-off: After approx. 3 min. of non-operation with the power on. After 1 hour in wireless mode.
Quick power on: By pressing the camera’s shutter release button halfway

Sync Modes

Leading curtain sync, Trailing curtain sync, Contrast control sync, High-speed sync

Power Supply

Four AA batteries, (Alkaline (LR6), Nickel-Metal Hydride (Ni-MH), or Lithium (FR6)

Weight W/o Batteries

Approx. 350 g (12.3 oz.)

Product Videos

Pentax D-SLR Wireless Tutorial - Extremely Detailed (08:18)
Gary Fong shows how to setup the Pentax D-SLR system for off-camera, or multiple flash wireless mode. This video includes a button-by-button tutorial, including a sample two-camera shoot using the Pentax system. Camera used in this demo is a K-5ii.
  • Pentax D-SLR W...
    Gary Fong shows how to setup the Pentax D-SLR system for off-c...

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