The master is the unit that triggers the other flashes (slaves) to go off. As a master unit you may have dedicated speedlite transmitter or speedlite flash with Master mode. It is common that higher-end speedlites support master mode, either optical or radio master mode.
Besides genuine Canon or Nikon speedlites, there are also flashes of other brands that can act as a master unit in Canon and Nikon wireless flash system. We will mention just few of them. Yongnuo YN568EX II supports optical master mode for Canon wireless system. Pixel X800C Pro and X800N Pro support both optical and radio master modes, as well as Godox TT685C and TT685N. Meike MK910 for example supports only optical master mode for Nikon CLS system.
There are numerous speedlite transmitters which act as master units in the wireless flash systems. Yongnuo YN-E3-RT, YN622C-TX, YN622N-TX, YN560-TX wireless transmitters are capable of controlling flashes as well – therefore acting as the Master. Pixel King Pro, Godox X1C and X1N also act as master units. On the contrary, the slaves are a group (or groups) or flashes controlled by the master unit.
Below is the list of all speedlite flashes and wireless triggers/commanders that can act as master units.
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Yongnuo YN680EX-RT Lithium Wireless High-Speed TTL Speedlite utilizes a rechargeable lithium-ion battery pack, to provide a super quick recharge time of just 1.5 seconds at full power. The flash is Canon RT compatible and features TTL, HSS and high guide number of 60m
Yongnuo YN320EX S TTL Flash is an excellent compact size flash unit that provides TTL, HSS and has a radio receiver built-in. It is a perfect on-camera flash for any camera system and especially mirrorless system
Yongnuo YN968N II TTL Speedlite for Nikon Cameras is a high-end speedlite compatible with Yongnuo YN622 radio system. Yongnuo YN968N II flash supports i-TTL metering. It features a powerful guide number of 60m (ISO 100, 200mm) as well as a long zoom range of 20-200mm, along with a wide-angle diffuser for 14mm coverage on full-frame cameras.
Godox V350F is a compact speedlite with advanced functions including TTL, high-speed sync, a built-in 2.4 GHz radio system, and a rechargeable lithium-ion battery capable of 500 full power flashes. V350F is a perfect on-camera flash for any photographer who prefer smaller yet powerful flash
Godox V350O is a compact speedlite with advanced functions including TTL, high-speed sync, a built-in 2.4 GHz radio system, and a rechargeable lithium-ion battery capable of 500 full power flashes. V350O is a perfect on-camera flash for any photographer who prefer smaller yet powerful flash
Godox V350S is a compact speedlite with advanced functions including TTL, high-speed sync, a built-in 2.4 GHz radio system, and a rechargeable lithium-ion battery capable of 500 full power flashes. V350S is a perfect on-camera flash for any photographer who prefer smaller yet powerful flash
Godox V350N is a compact speedlite with advanced functions including TTL, high-speed sync, a built-in 2.4 GHz radio system, and a rechargeable lithium-ion battery capable of 500 full power flashes. V350N is a perfect on-camera flash for any photographer who prefer smaller yet powerful flash
Yongnuo YN560-TX PRO Flash Controller for Canon is the new generation of flash triggers from Yongnuo which starts a completely new radio system that integrates the YN560-TX and YN-622 Radio Systems into one cohesive system
Yongnuo YN560-TX PRO Flash Controller for Nikon is the new generation of flash triggers from Yongnuo which starts a completely new radio system that integrates the YN560-TX and YN-622 Radio Systems into one cohesive system
Godox V350C is a compact speedlite with advanced functions including TTL, high-speed sync, a built-in 2.4 GHz radio system, and a rechargeable lithium-ion battery capable of 500 full power flashes. V350C is a perfect on-camera flash for any photographer who prefer smaller yet powerful flash
Yongnuo YN585EX Speedlite for Pentax Cameras offers full P-TTL support, including rear curtain sync and red eye reduction. YN585EX offers a powerful guide number of 58m at ISO 100 and 105mm as well as a zoom head with coverage for lenses of 20-105mm. Also, it has a wide-angle diffusion panel that expands the beam to work with 14mm lenses. Along with these capabilities, the YN585EX can tilt from -7 to 90° and can rotate both left and right 180°.
Yongnuo YN568EX III Speedlite for Nikon Cameras is a great choice for both professional or advanced amateur Nikon shooters. It is features rich, supporting i-TTL, HSS, 2nd curtain sync, wireless master and optical slave modes, auto and manual zoom, flash exposure compensation, flash exposure bracketing and much more.