For your Sony a6700's demanding 4K video and fast burst shooting, a UHS-II V90 rated SD card is essential to avoid buffer limitations and dropped frames. SanDisk Extreme Pro V90, Sony Tough G-series V90, and ProGrade Digital V90 cards are all excellent, reliable choices that deliver the necessary performance. Ensure you select a sufficient capacity, ideally 128GB or 256GB, for extended shooting sessions.

Basically, everyone here is saying UHS-II is the way to go, which is 100% true for the a6700 if you don't want to be stuck waiting on that buffer. Honestly though, unless you're shooting 4K 120p at the absolute highest bitrates or doing crazy long bursts, V90 might be overkill for ur wallet. A solid card like the Kingston Canvas React Plus V90 is often way more budget-friendly while still giving you that top-tier speed. If you want to save even more, the Sabrent Rocket V60 is totally fine for almost all standard 4K shooting scenarios. Quick tip: Don't forget the card reader! Getting a high-speed card but using a cheap USB 2.0 reader will make offloading ur footage a total nightmare. Make sure you have a dedicated UHS-II reader to actually see those transfer speeds. Tbh, the Angelbird AV Pro SD MK2 V60 is also super underrated for reliability if you're looking for alternatives to the usual big brands.

The a6700 benefits from UHS-II cards if you shoot a lot of bursts or 4K. I use Lexar Professional 2000x UHS-II cards and they've been reliable. Just avoid the no-name brands - I learned that lesson the hard way when a cheap card corrupted during a paid shoot!

SanDisk Extreme Pro UHS-II V90 is recommended.

Hey everyone, just jumped into this conversation and wanted to share a slightly different take from the technical side. While I totally get why people recommend the fastest cards, I am not 100 percent sure that V90 is actually mandatory for most a6700 users... honestly it might be overkill. IIRC, unless you are strictly shooting XAVC S-I at the highest bitrates, the camera doesnt even use that extra bandwidth. Most of the 4K modes on the a6700 actually top out at around 200 to 280 Mbps, which a decent V60 can handle without breaking a sweat. Someone told me they even got away with V30 for standard 4K 24p, though I wouldnt risk that myself for a paid gig lol. Basically, check your codec settings before dropping big money on those V90s just because they are the best specs on paper. You might find that a high quality V60 gives you exactly the same results for half the price.

Finally someone says it. Ive been thinking this for a while but wasnt sure.

Can vouch for this

For 4K video and fast burst shooting with your a6700, a V60 UHS-II SD card is ideal. SanDisk Extreme Pro, Sony Tough, and ProGrade Digital are all good choices. Consider ProGrade Digital for top performance, Sony Tough for durability, or SanDisk for a balance of both.

Any UHS-II SD card is OK.

UHS-II SD.