Have the Kingston CF not purchased at Amazon, but the local MM, but to initiate only. She is now also back. ^^ After I tested the CF in my Canon 50D, I imagined, that the access LED is longer than with my Sandisk CF (30MB / S) although this should be seen nominally faster here. So I created this time tested on the PC. With a USB 3.0 Reader and the tool h2testw I came to the following Results: Write about 10-17 MB / S and Read about 40-50 MB / S my Sandisk comes to 35-40 MB / s write and read 35-45 MB / S. Since 10-17 MB / S were really too slow and the card still costs in MM 50, I brought them back and me another Sandisk ordered.