Decided to give it a try after seeing Delkin cards alongside Sony/SanDisk in write speed performance tests in a Sony A7RIV case. Field test - with Sony A7RIV, shooting 61MP RAW uncompressed + JPEG (122MB + 31MB) until the buffer is full and waiting for the buffer to be cleared. Delkin v90 (uhs-ii) 128GB: 32 shots -> 36 seconds -ii) 64GB: 32 shots -> 34 seconds Transcend v90 (uhs-ii) 64GB: 32 shots -> 46 seconds SanDisk Extreme V30/A2 ( uhs- i) 170/95 Read/Write 128GB: 31 shots -> 1 minute 22 seconds I haven't tried Lexar/ProGrade/others as Sony is a known market leader and Delkin was only 5% slower, which is normal given the price. When I bought the 128GB, the Delkin was $130 versus the Sony's $200.
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