引用 I bought this adapter to replace another one I was disappointed with due to speed issues, and all around I'm happy with it - it allows me to put to good use the SDHC cards I bought for the Canon 450D after I've upgraded it to a Canon 5D mark II. Putting a SanDisk 16GB Extreme III 30MB/s Class 10 card, I can shoot video at 1920x1080 @ 25fps for as long as I want. Copying a big file on my computer to the card, I got ~78x. Shooting in continuous mode gives good speed for large fine JPEGs, but for raws w/o JPEGs the speed drops below usable rate once the buffer is full.