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30/10/2018 - Does anyone know when Sony will be releasing an update to fix the incompatibility of the latest SanDisk 128Gb Extreme Pro SD Cards in Slot 1 of the A7III???
Brian Smith is a sony ambasador. Explains the issue in detail.
https://briansmith.com/sony-a7-iii-warning-sandisk-128gb-extreme-pro-uhs-i-sdxc-memory-cards/
Wow, Luckily I am using Sandisk 32GB exterme pro (298mbs) cards in slot 1 and they work perfectly - I did consider going with a larger card but am holding off due to this issue.
The 32GB does give me over 1000 images (only shoot Raw) and that is generally enough for what I need and I do also carry a spare just in case.
Lets hope Sony can rectify the issue.
Please can we get Sony to release a firmware to correct this issue. Its affecting every new Sandisk Extrene pro card on all SOny Alpha Cameras ... especially A7iii, A7R3 and A9. The cards will work in slot 2 but not in Slot 1. Please please please Sony do something.
By the way its not just 128gb cards .. its happening on 64gb ones too ... I havent bought any new 32gb ones recently so cant comment on those.
Agreed, have exactly the same issue with a a7 iii and SanDisk 64GB
formatting doesn't help unfortunately, same error