Consider the Godox V1 or V1PRO for on-camera flashes, but I strongly recommend investing in a trigger and an external flash like the Godox AD200 Pro II. This combination will provide significantly more options and superior results. On-camera flash is primarily suitable for fast-paced event photography. However, for most other scenarios, the AD200 paired with a modifier will dramatically outperform on-camera options, offering enhanced versatility and image quality that's simply unmatched.

Check this article:

Best Flash for Sony a7 IV – Camera Review

Finding the perfect flash for your Sony a7 IV can transform your photography from good to extraordinary. After extensive…

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 Godox V1 or V1PRO are best choices.

Godox flashes are less expensive, so you can choose them if you're on a budget. However, if you are concerned about after-sales service, then consider the Sony HVL-F60RM2. It is a good flash, although not as affordable as Neewer or Godox options.

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I highly recommend the Sony HVL-F60RM2 flash. It's a powerful unit with a guide number of 60 meters at ISO 100, which is more than enough power for most situations. It has a versatile bounce/swivel head, making it easy to achieve different lighting angles. Plus, it can act as a wireless commander to control off-camera flashes, so it has the expandability you're looking for. It's also optimized to work seamlessly with Sony's metering system.

If you are looking for a high-end professional flash light, the Profoto a10 is the best choice I think.

I'm using Godox V860iii and it's a pretty good flash with a cheap price tag.

While it's not the most powerful, the Sony HVL-F28RM is a gem of a compact flash for the a7 IV. If you prioritize small size, this one delivers. It still has radio control, tilts and rotates, and puts out a respectable GN28. The video light is an added bonus. For travel or as an always-in-your-bag flash, the F28RM is hard to beat.

I've spent a lot of time testing different setups on my a7 IV and honestly, the Sony HVL-F46RM is a very logical choice for users who dont need the massive output of the 60 series. It integrates perfectly with the camera's face detection to balance exposure, which is a major technical advantage over third-party options. It is compact enough that it doesnt make the setup front-heavy during long shoots. If you're planning to build a larger off-camera kit eventually, the Westcott FJ80 II Speedlight is a decent alternative. The color consistency is excellent and the touch screen interface is far more intuitive than most button-heavy flashes. Quick tip... always check the foot material before buying. The metal feet on these newer units are much more durable for event work where things tend to get knocked around. Both of these will work fine as masters for their respective wireless systems.

Like someone mentioned, staying within the Sony ecosystem for the shoe connection is usually the safest bet for long-term reliability. I have been extremely satisfied with the Sony HVL-F46RM Wireless Radio Flash lately. It is a bit more compact than the flagship 60 but still packs a punch for indoor portraits. The way it syncs with the a7 IV face detection is honestly a huge plus. It adjusts the flash output based on the subjects face exposure, which saves a lot of time in post. I havent had any overheating issues even during longer sessions. It is a very reliable choice if you want something that just works every time you slide it onto the MI shoe. A few other solid options I have tested:

• Westcott FJ80 II 80Ws Universal Speedlight for its excellent color consistency
• Godox TT685II-S Flash for Sony if you prefer using AA batteries over Li-ion packs The Westcott unit is particularly nice because the interface is so much better than the Godox menus. It is very intuitive. If you end up going with the Sony unit, let me know and I can walk you through the wireless settings because the menu system can be a bit deep at first.

Anyone use Profoto A10 on a7IV, do the price worth it ?

Another option to consider is the Profoto A10 AirTTL-S Studio Light. While it's more expensive than traditional speedlights, the A10 offers superior light quality and power in a compact form factor. It has a round head that produces a natural-looking light spread and can be used both on and off-camera. The A10 supports TTL metering, high-speed sync, and has built-in AirTTL radio control for wireless triggering. If you're looking for professional-grade light quality and performance, the Profoto A10 is an excellent investment for your Sony a7 IV.

Try off camera flash, such as Godox AD200 Pro II.

Huh interesting. I had no idea. The more you know I guess 🤷