Master unit in flash system
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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Shanny SN600EX-RF
Shanny SN600EX-RF is a 2.4GHz wireless radio master and slave speedlite flash, with a high guide number of 60 (iso100, 200mm), high speed sync and full E-TTL support. SN600EX-RF is an excellent flash. The 2.4 GHz radio transmission built-in is amazing since it is very reliable and gives very accurate results. It is really well built and it is loaded with features.
Shanny SN600EX-RF features a built-in 2.4 GHz TTL transceiver, which can function both as a master and a slave to other SN600EX-RF flashes. Shanny did a great job making a flash that not only performs excellent, but is also very well built and user friendly.
Shanny SN910EX-RF
Shanny SN910EX-RF is an excellent flash. The 2.4 GHz radio transmission built-in is amazing since it is very reliable and gives very accurate results. It is really well built and it is loaded with features. The addition of built-in transceivers was something that Nikon users have been waiting for and We think Shanny made the right step of making this mainstream
Shanny SN910EX-RF features a built-in 2.4 GHz TTL transceiver, which can function both as a master and a slave to other SN910EX-RF flashes. Shanny’s so-called W-CLS, or Wireless Creative Lighting System is an aftermarket radio protocol for Nikon-compatible flashes
Shanny has managed to make a flash that not only performs excellent, but is also very user friendly