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p.54 #9 · p.54 #9 · Pre-orders open! Sony A7R III and FE 24-105mm f/4 OSS lens! | |
arbitrage wrote:
This is the most in depth testing I've seen for the A9.
https://www.cameramemoryspeed.com/sony-a9/fastest-sd-cards-uhs-i-vs-uhs-ii/
Relevant paragraph from that test:
"Recording RAW and JPEG separately can provide a slight increase in speed over writing both RAW and JPEG to Slot 1 when using fast cards. Using a somewhat slower card in Slot 2 reduced the speed but even cards that averaged 45-50 MB/s write speed provided performance that was about equal to recording both image types to the fast card. Since JPEG and Slot 2 performance are much slower than the UHS-II speed and faster RAW processing speed, there is little penalty in using a UHS-I card that is slightly slower in Slot 2. As long as the card in Slot 2 can maintain about 50MB/s write speed the penalty is minimal when shooting RAW and JPEG separately.
The default when setting the A9 to "Sort JPEG/RAW" mode is to save the RAW to Slot 2 and JPEG to Slot 1. This is not a favorable configuration when using UHS-II cards because the larger RAW file is written to the slower UHS-I card slot. The solution is to set the default card to Slot 2 by changing "Select Rec. Media" to Slot 2, then RAW images are recorded to Slot 1 and JPEG are saved to Slot 2. The difference between these settings can be seen by comparing the first two rows in the table above."...Show more →
Thanks for this. It seems for guys like me who are not too concerned about redundancy, that the way to go is RAW to slot 1 on a fast UHS-II card and JPEG to slot 2 on a fast UHS-I (or II) card.
Personally, I’m getting one of the new Sony SF-G series for slot 1 and will use my existing M series card in slot 2.
It’s interesting that with this camera the Lexar cards outperform the Sony by a small margin while the Sony S1 card reader sees the opposite.
One thing I noticed is that the write performance increases with uncompressed RAW compared to compressed RAW which implies to me that the compression process is limiting the output to the card. In other words, compressed RAW output is throttled by the processing speed and not the card or transfer process. Unless I’m missing something. However, this small difference is inconsequential as you get a lot more compressed shots in the buffer than uncompressed shots so you’re far less likely to fill the buffer in the first place.
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