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Pentax AF540FGZ (MZ/PZ/SF/ZX/DSLR) Flash [GN177' AT 85mm] {Bounce, Swivel, Zoom}

KEH Model# 241544

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* Item pictured for illustrative purposes only, actual item not pictured. See 'Notes' next to grade for included items.

Pentax AF540FGZ (MZ/PZ/SF/ZX/DSLR) Flash [GN177' AT 85mm] {Bounce, Swivel, Zoom} Description


Pentax AF540FGZ Auto Flash

The PENTAX AF540FGZ auto flash unit features a large guide number of 54 (at ISO100/m). This clip-on, twist/tilt, auto-zoom flash provides a variety of advanced flash applications, including P-TTL auto flash, high-speed synchronization and wireless P-TTL auto flash, when mounted on a PENTAX digital SLR camera.

KEH Specifications

  • Mount: Shoe
  • Bounce Head: Yes
  • Swivel Head: Yes
  • Coverage: 23° - 60° 
  • Zoom Head: 24mm - 85mm
  • Recycle Time: ~ 4.5 - 6 seconds
  • Battery Type: Four AA batteries 
  • Dimensions: 3.0" x 5.6" x 4.2"
  • Weight: 13.4 oz


General information

Manufacturer Part Number 30425
Manufacture GTIN 0027075116269
Brand Name Pentax
Product information
Additional Information

Wireless Flash:

  • Control system: Optical pulse transmission
  • Wireless position: Master (M), control (C), slave (S)
  • Channels: 1 through 4
  • Compatible modes: P-TTL, auto (A), manual (M)
Number of Batteries Supported
Product Model
Maximum Flash Recycle Time
6 Second
Minimum Synchronization Shutter Speed
Maximum Synchronization Shutter Speed
Autofocus Assist
AF Assist Beam
Battery Model Supported
  • LR6
  • FR6
Guide Number
  • 45 m/148 ft at ISO 100 (50 mm Zoom-head Setting)
  • 54 m/177 ft at ISO 100 (85 mm Zoom-head Setting)
Light Angle
  • 85° Vertical (Flash)
  • 98° Horizontal (Flash)
Flash Modes
  • P-TTL
  • TTL
  • Automatic
  • Manual
Power Source
  • Battery
Battery Size Supported
  • AA