So, looking at the market right now for the a7 III, you’ve basically gotta decide between staying native or going third-party. Sony’s own speedlights are obviously gonna have the best "handshake" with the camera's AF system, but honestly, the price-to-performance ratio is kinda rough for most event photographers starting out. If you've got a massive budget, those high-end boutique brands like Profoto are the industry standard for color consistency, but you’re gonna pay a huge premium for that name. Tbh, I’d just look at the third-party ecosystem. Brands like Godox have basically disrupted the whole market because their wireless protocols are so reliable now. My advice? Just get whatever their top-tier unit is that uses a lithium-ion battery pack instead of AAs. The recycle speeds on those li-ion units are a total game changer when you’re shooting fast-paced receptions; you really don't wanna be waiting on your flash to cycle during a key moment. Plus, the thermal management is way better than the old-school stuff. Just pick a brand with a solid radio ecosystem so you can grow into off-camera setups later without a headache.

Godox V1 is recommended. https://www.bhphotovideo.com/c/search?Ntt=Godox+V1+sony&BI=8941&KBID=10361&SID=12345&DFF=d50

Would love to know this too

For fast-paced indoor events like weddings, the Godox TT350S is a suitable choice for your Sony a7 III. It offers a fast recycle time of 0.1-2.2 seconds, supports TTL and high-speed sync up to 1/8000s, and features a built-in wireless transmitter for off-camera setups. Its compact and lightweight design makes it ideal for event photography. To achieve soft, consistent lighting, consider using a diffuser or softbox attachment with the flash. Prioritizing TTL and high-speed sync will enhance your ability to capture dynamic moments in varying lighting conditions.

I totally agree with the Godox suggestions, especially since native Sony glass is already expensive enough... you dont want to drop another $500 on a flash if you dont have to. While the TT350S is light, honestly for a fast-paced wedding, it might struggle to keep up with recycle times. If you want the best bang for your buck, I'd look at the Godox V860III-S TTL Flash for Sony. It uses a lithium-ion battery instead of AAs, which is a total game changer for events. You wont be swapping batteries mid-ceremony, and the recycle speed is way faster than the cheaper models. Compared to something like the Sony HVL-F60RM2 Wireless Radio Flash, you're getting basically the same real-world performance for a fraction of the cost. If you want that soft light you mentioned, just grab a MagMod MagSphere 2 or even a cheap generic bounce dome. It makes a huge difference without being as bulky as a full softbox on your camera.

Just wanted to say thanks for everyone chiming in. Super helpful discussion.

Godox V1 S.