The Sony HVL-F28RM External Flash is a compact and portable lighting solution, boasting an impressive guide number of 92' at ISO 100 and 50mm. It is equipped with a built-in 2.4 GHz radio transceiver, enabling photographers to effortlessly establish portable lighting configurations with full compatibility for P-TTL / ADI metering. This flash can function as either a commander or a remote, fully supporting Sony's existing radio commanders and receivers, including ratio control and the capability to operate with up to 15 flashes across five groups. In terms of design, the HVL-F28RM features a pocket-sized form factor that is ideal for the a7-series mirrorless cameras, along with a tilting head that adjusts from 0 to 120° for versatile bounce control. Furthermore, it is constructed to be dust- and moisture-resistant, complemented by a robust metal foot.

• Equipped with a 2.4 GHz radio transceiver, the HVL-F28RM is able to operate as either a radio commander or remote as part of Sony's radio wireless system, including the FA-WRC1M Wireless Radio Commander and FA-WRR1 Wireless Radio Receiver. This system has an operating range of approximately 115' and does not require line-of-sight. Also, it will support up to 15 flashes in five groups on one of 14 channels. Additionally, it has full support for Sony's P-TTL / ADI metering system, including high-speed sync and ratio control.
  
  
• 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
  
  
• Guide number of 92' at ISO 100 and 50mm.
  
  
• Flash head offers 0 to 120° of tilting for bounce control.
  
  
• Covers a 50mm focal length field of view and pull-out wide panel broadens this coverage to a 24mm focal length field of view.
  
  
• Manual power adjustment is possible across 25 levels, covering full 1/1 power down to 1/256 power.
  
  
• Can fire continuously for up to 40 flashes at a rate of 10 flashes per second.
  
  
• Slow, high-speed, 1st and 2nd curtain sync is supported on cameras with TTL communication.
  
  
• Recycle time of 0.1 to 6.4 seconds with alkaline batteries or 0.1 to 4.1 with NiMH batteries.
  
  
• Improved resistance to overheating for longer and more rapid shooting sessions.
  
  
• Dust and moisture-resistant construction enables its use in harsh environments and a durable metal shoe has been added for improved mounting stability.
  
  
• Requires two AA-sized batteries, either alkaline or NiMH, as a power source.
  
  
• Micro-USB port can be used for firmware updates.