Very disappointed with sandisk instantly. I am however not demanding performance but there anemic rates handwriting make using this card in a rélfex be discouraged, not to mention burst mode. All you need is the easy bit initiation and machine easily find themselves still for several seconds, the time to write to the card. After information, it does appear that this card only reaches 10 MB / S. My RAW files already making 25 MB / S, we quickly understand the problem. In short down cards and exchanged for euros transcend some more expensive but much more efficient.