V90 card not working with A7S3

[Eric Elmer]

I've got into an extremely wired situation. I've been using a Lexar V60 card that worked perfectly with all the A7SIII recording modes I need except 240fps. Sony wants a V90 for that. So I bought a separate card for that option. I went with a Kingston Canvas React Plus which has nice reviews and scored a second place after Sony own card on a Sony A7S3 speed test (you can observe it here - https://www.memorycard.guru/-Cameras/Sony-Alpha-7s-III). So.. imagine my surprise, when I injected the card in the camera, formated it there.. and  nothing worked! It records only as a V30. Not even V60 material is recorded and of course no V90! Sony gives me warnings and won't let me record anything rather than 4k24 most basic codec stuff! 

Anybody has any idea? I wrote to Kingston already.

I did a CrystalDisk test on my PC and it shows 308 read and 244 write speed.