I recently purchased a Fujifilm X-T2 and one thing it has over the crop sensor APS-C Sony a6xxx family (a6000 / a6300 / a6500) is dual SD card slots. This is useful in case your card experiences a failure while you’re out on a photoshoot.
The X-T2 is equipped with two UHS-II slots that can be setup for backup (complete copy between both cards), overflow (fill up card slot 1 first and then continue to fill up card slot 2), or RAW + JPEG pairing (RAW in card slot 1 and JPEG in card slot 2). It also has a nice 1GB buffer that takes awhile to fill. You can be pretty trigger happy and find that the camera can keep up as long as you have a fast enough SD card.
See this chart comparing the theoretical speeds achievable by UHS-I and UHS-II:
Tests by other folks on the internet have shown real world speeds of ~70MB/s for UHS-I cards and ~150MB/s for UHS-II cards.
With a 1GB buffer and UHS-II slots, you can get really good performance from the camera when burst shooting. The uncompressed RAW files from the camera are around 50MB a piece, which can fill up a card quickly.
I have been using Sandisk SD cards for almost a decade now, and for the best price/performance combination the Sandisk Extreme Pro SD cards are my recommendation for most users. They are rated at 300MB/s for UHS-II on the high end, or you can drop down to the 95MB/s UHS-I versions for much more reasonably priced cards.
If you are looking to squeeze every bit of performance from the UHS-II slot, then you should go with the Lexar 2000X UHS-II 300MB/s series cards. Lexar is also a reputable company for SD cards and they have been shown to barely inch past the performance of the Sandisk Extreme Pro 300MB/s UHS-II cards.
I don’t need the burst capacity so I have been doing just fine with the 95MB/s cards. I will consider moving onto the UHS-II cards as price-to-performance drops a little bit lower.
SanDisk Extreme Pro SDHC UHS-I Card – 95MB/s
SanDisk Extreme Pro SDHC UHS-II Card – 300MB/s
Lexar Professional 2000 SDHC UHS-II Card – 300MB/s
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