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FORUMS General Gear Talk Camera Vs. Camera 
Thread started 20 Apr 2018 (Friday) 04:16
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Writing speed of Sony A7R III???

 
oharing
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Apr 20, 2018 04:16 |  #1

Does anybody know what is the actual writing speed of the a7r III for RAW uncompressed photos on the faster SD card slot?

I can't find any info on that....

THANKS!


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jtra
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May 23, 2018 00:34 |  #2

In this Polish review:
https://www.optyczne.p​l …tkowanie_i_ergo​nomia.html (external link)

They show measurements with Sony Sony SF-G UHS-II with write speed 299 Mb/s in several graphs. There is a time axis and blue ticks indicate captured frames. Initially speed is high, then it slows down as buffer is near full.
For uncompressed RAWs, they get:
10 fps mode: 3 seconds of 10 fps, then continues 1.7 fps, after stop buffer clears in 13s. So buffer can hold about 30 frames (maybe less because some gets written before it gets full) where each one is 85MB so 2550MB gets cleared in 13s, that is 196MB/s write speed (or maybe bit less).

Writing JPGs is much slower (buffer clears in 2 minutes 23 seconds, it also impacts frame rate when buffer is full, you get only 0.5 fps once buffer is full).




  
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Writing speed of Sony A7R III???
FORUMS General Gear Talk Camera Vs. Camera 
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