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 p.2 #15 · v.60 versus v.90 for X-T5? (updated 1/18/22) | |
inkinutz wrote:
So I've been pondering this exact question and came across this post.... V60 vs V90 SD card performance in my X-T5. I just bought a Kingston V90 card, so I decided to do some testing.
I used the following 3 cards.
- 128GB Sandisk Extreme Pro 95 MB/s (my oldest of the three without any V rating at all)
- 256GB Lexar Pro 1000X 150 MB/s
- 128GB Kingston Canvas React Plus V90 300MB/s
My testing methodology isn't exact by any means, but more to see general trends in how these cards performed in my X-T5.
- Video -
This was the easiest to test since the X-T5 maxes out at 360 Mbps. This equates to 45 MB/s. Keep in mind, that's regardless of the resolution ... 4K, 4KHQ, 6.2K, the maximum bitrate the camera offers is 360 Mbps, which means the camera will not write data to the card any faster than 45MB/s. All 3 of my cards were able to record without issue (6.2K / 29.97P / H.265 All-I 422 / 360 Mbps). This means for video, you will not see any additional benefit in camera for cards over V60. If you shoot lower bitrates, then slower cards will work fine for recording as well. i.e. If you're shooting 4K at 50Mbps, I don't see why old C10 SD cards that max out at 10 MB/s writes wouldn't work.
- Photo -
Testing this was more involved. Since what does one really mean by "camera performance" anyways? I'm sure there might be other aspects of performance a faster SD card might contribute to, but for the purposes of this test, I decided to focus on filling and emptying the buffer.
Here's my camera setup for the tests:
Image size L 3:2 / JPEG
Film Simulation STD
No effects or adjusted settings for Tone, Color, etc etc.
AF-S
Electronic Shutter / 13fps (didn't want to waste my clicks with MS)
Testing procedure:
Using my phone's stopwatch.
Press the shutter (shooting in high burst) and "start" on the stopwatch simultaneously
Keep the shutter depressed until I hear the shutter noise stop or stutter.
The moment I let go of the shutter, I also press "lap" on the stopwatch.
When the blinking light on the camera stops, I press "lap" again.
Log the two times from my stopwatch; Time it took to fill the buffer & Time it took to empty the buffer.
Log the number of shots taken.
Log the total file size for all the files generated.
I did the above procedure....
- twice writing Lossless Compressed RAW only.
- twice writing Lossless Compressed RAW + FINE JPG
- once writing Uncompressed RAW only
- once writing Fine JPG only
... and I did this for each of the 3 cards.
See results in my table below.
My main takeaways are ....
1) my old trusty Sandisk Extreme Pro 95 MB/s performed really really well.
2) the V90 card performed spectacularly. However, I only see this benefiting only those really high demand shooters that need to burst frequently. When shooting RAW, you'll only get a few extra frames before the buffer fills up. But, and this is a biggy, that buffer will empty out nearly 3 times faster than the V60 card. This will allow you to do a full burst again much sooner.
3) Look at the V90 card JPG shots. I had to do it twice just to be sure. Over 400 shots before the shutter started to stutter!
I hope this will help someone with their V60 vs V90 SD card decision for their X-T5. I'm sure I missed something somewhere. So if there's something wrong, or you guys have any questions, do let me know!
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https://www.dannyink.com/FM_Photos/buffer.png |
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https://www.dannyink.com/FM_Photos/3SD.jpg |
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Thanks for that, useful info.
It seems to me that for still picture operation the important parameter is write speed, and it is not easy to find that out. Not sure what Video ratings will have to do with that.
I did some similar tests 10 years ago with my Nikon D7000, which was (and is) dismal when it came to bursts for sports photography (I remember roughly a dozen compressed RAW to fill the buffer and best part of a minute to clear the buffer) with the cards then available.
Since buying the Xpro2 about 6 years ago I've been using those good old SanDisk 95mbs cards that you have. I also tried the 170mbs versions, which seem to have no better write speed, and the Xpro2 didn't like them, but they work OK in my Xt3. These cards work ok for anything I normally do. These are only rated V30 but happily deal with my family 4k video.
When I bought the Xt3 I got a pair of the UHS-II '300mbs' SanDisk cards, they do clear the buffer much quicker, but I haven't needed to use them much as the Xt3 has a big enough buffer to hold all that I normally do. As far as I can find out these cards have a write speed of 'up to 250mbs'. Presumably if the write speed will equal the max speed the camera can generate (somebody above mentioned 360mbs?) then the buffer could be kept below saturation.
Gerry
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