Digital Camera Warehouse
Sony GN20 Flash #HVLF20AM

Sony GN20 Flash #HVLF20AM

Expand your creativity with the revolutionary HVL-F20AM compact external flash, which extends illumination range beyond the camera's built-in flash. Bounce flash enables shadow-less indirect lighting while TTL (through the lens) flash exposure is automatically controlled by your α DSLR for easy and intuitive operation—all in an ultra-compact design which folds flat when not in use.

  • Easy intuitive operation
  • Slim, light, compact design
  • Adjustable bounce angle (75 degrees)
  • Folds down in flat position when not in use
  • Ideal for use as Wireless Flash Trigger for DSLR-A900

Sony GN20 Flash #HVLF20AM, Side view.

Sony GN20 Flash #HVLF20AM, Shown on camera, Camera and lens not included.
* camera and lens not included

Key Features

Extends flash range beyond camera’s built-in flash
Though compact and lightweight, the HVL-F20AM has a maximum range twice that of the built-in flash units on α230, α330 and α380 cameras. This is represented as the guide number (GN) of 20 with a 50mm focal distance at ISO 100.

Easy intuitive operation
Unlike most external flash units, the HVL-F20AM has no dedicated ON/OFF switch. Instead, power is automatically switched on simply by raising the flash unit into the shooting position. In addition, a switch on the side of the unit offers Indoor and Outdoor settings, making it easy to obtain flash illumination that suits the shooting situation. A charging lamp indicates when the flash is ready to fire.

ADI Flash Metering System
The ADI (Advanced Distance Integration) flash metering system offers the optimum flash metering and automatic white-balance compensation regardless of the background conditions or the subject's reflectance. ADI flash metering works in combination with α cameras and lenses that incorporate a distance encoder. When used with these lenses, the camera calculates a guide number to control TTL (through the lens) flash metering. This guide number is calculated according to distance from the subject, ambient light and pre-flash reflectivity of the subject and the background.

Bounce flash enables shadowless indirect lighting
When set to ‘indoor’ shooting mode, the flash points up to bounce light off the ceiling for shadowless illumination of your subject. When set to the ‘outdoor’ shooting mode, the flash directs light directly at your subject.

Light (90g / 3.2oz), slim (24mm / 1”) ultra-compact design
With a weight of only 90g (approx.) and a thickness of only 24mm (1 inch), the HVL-F20AM is so compact it can simply be folded down and left mounted on the camera when it is not in use, or detached and carried in a shirt pocket. When removed from the camera, the flash unit's hot shoe can be folded to the side, making the body even more compact.

Wireless flash trigger function (DSLR-A900 only)
When teamed with the α900, the HVL-F20AM can also be used to trigger wireless flash setups. Please note, however, that this functionality is only available with DSLR-A900, and does not include luminosity ratio control.

Built-in diffuser for wide and telephoto shooting
With the built-in diffuser the flash illumination covers an angle of view of 27mm at the default Standard Position setting. If users want to to shoot at a greater distance, they can rotate the dial on the side of the flash unit to the ‘Tele’ Position*. Although this reduces flash coverage to an angle of view of 50mm, it extends the range to illuminate more distant subjects.

Elegant and attractive styling
Viewed from any angle, the HVL-F20AM's revolutionary body is sleek, slim, and virtually protrusion-free. The new design also eliminates the LCD display panel found on many conventional flash units, further contributing to easy-use simplicity and stylish design.



Dimensions (W x H x D)

62 x 94.6 x 24mm


Approx. 98g

Operating Temperature

+0 to +40°C

Storage Temperature

-20 to +60°C

Battery Power Requirements

Type / Required Number

AAA Alkaline or AAA Ni-MH Battery / 2

Flash Function

Shooting Distance

F2: 1m to 10m

Guide Number

Worth 20 (at 50mm lens focal distance)

Number of Flashes

More than 90 times (Alkaline battery)

Lighting Angle (Vertical)

Approx. 34 degrees (at 50mm lens focal distance)

Lighting Angle (Horizontal)

Approx. 46 degrees (at 50mm lens focal distance)

Colour Temperature

Approx. 5500K


Intelligent Accessory Shoe

Automatic Light Control


Bounce Angle

Upward 75 degrees



Wide Panel


Lighting Angle (Vertical) - When using the wide panel

Approx. 55 degrees

Lighting Angle (Horizontal) - When using the wide panel

Approx. 72 degrees

* Specifications subject to change by the manufacturer without notice