Godox V1 is a great choice for Sony a6400.

I recommend the Godox V1 or Godox V860 III. Just based on how much you want to spend.

Regarding what #11 said about "The Godox TT350 is a really compact and..."

• I totally agree on the compact side of things. I spent way too much time looking for a flash that wouldnt make my camera tip over when I put it down. I ended up getting a really small unit that runs on just two batteries and honestly, I couldnt be happier. What I learned is that for a crop sensor like this, you really dont need some massive pro rig. My current setup just works well because the TTL communication is snappy and the exposure is basically spot on every time. Its not the fastest at recycling after a big burst, but for family stuff its perfect. Makes the whole kit feel like a point-and-shoot rather than a heavy burden. No complaints from me so far.

I use V860 III from Godox. Works well.

The new released Godox V1 Pro is even better.

Like other said Godox V1 and V860iii are best choices for Sony a6400.

I use Godox TT350, works OK on a6400.

Here are some top recommendations:

1. Sony HVL-F32M

• Compact and lightweight flash designed for Sony's mirrorless cameras
• Guide number of 32 (at ISO 100)
• Tiltable flash head and bounce capabilities
• Wireless control with optical transmission
• Good balance of power, features and price

2. Godox TT350S

• Compact flash with a guide number of 36 (at ISO 100)
• Full TTL support for Sony cameras
• 360° rotation and tilt-able flash head
• 2.4GHz wireless radio transmission
• Affordable third-party option with good performance

3. Sony HVL-F45RM

• Mid-range flash with a guide number of 45 (at ISO 100)
• Radio controlled wireless shooting up to 30m
• Tiltable and rotatable flash head with bounce and swivel
• Quick shift bounce system and modeling light
• Higher power and more advanced features compared to the F32M

The Godox TT350 is a really compact and budget flash for a6400. Love it.