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With a notably slim, compact design and ADI / P-TTL support, the HVL-F20M External Flash from Sony is ideal for those looking to add a little fill light to their images or for use as a wireless TTL controller for off-camera flash units without adding too much weight to their gear bag. It offers a modest guide number of 66' at ISO 100 and 50mm along with two coverage settings for 27mm or 50mm with full-frame sensors. Also, the unit can tilt the flashtube upward 75° for achieving softer, more diffuse bounce lighting.
For remote triggering of additional off-camera flash units, the HVL-F20M is able to work as a TTL controller. Also, it has slow, first and second curtain sync settings and will recycle in 0.1 to 5 seconds. Additionally, it runs on 2 AAA batteries and comes with a terminal protector cap and a carrying case.
This unit is compatible with Sony's Multi Interface Shoe and is not natively compatible with the older Sony/Minolta Auto-Lock Accessory Shoe. Though, with the use of ADP-AMA Shoe Adapter, Sony cameras with the Auto-Lock Accessory Shoe can be adapted to use Multi Interface Shoe external flashes with full compatibility.
Advance Distance Integration (ADI) flash metering works with cameras and lenses with distance encoders to more accurately balance flash output with ambient light and subject reflectivity by taking camera-to-subject distance into account
Effective range of 3.3 to 16.4' when used at ISO 100 and f/2.8
Battery life of approximately 90-150 flashes
White balance information is automatically transferred to the camera
Turn the flash on or off by simply raising or lowering the flash unit
Flash-ready indicator light
65.62' (20 m) ISO100 at 50 mm position
Angle of Coverage
Wide-Angle Adapter: 74.3° 46°
+0° to +75°
27 mm - 50 mm (Full frame)
3.28 to 16.40' (1 to 5 m) at f/2.8
Off Camera Terminal
Approximately 0.1 - 5 seconds
-3 EV to +3 EV (in 1/3 EV steps) In-camera control
Method: Optical pulse Distance: Up to 16.40' / 5 m