David Farkas;1053 wrote:
In SD, your best bet is a Class 10 SDHC card, but you’ll be limited to download speeds of only about 30-40MB/s to your computer. Here, I find CF to be much, much faster.
SD cards with the UHS-1 spec should be as fast as the fastest CF cards, if the camera and card reader support UHS-1. Otherwise it will only do Class 10 speeds.
You need a SD “UHS-1” USB3 card reader to get fast downloads. I don’t know if there is a Firewire-800 UHS-1 capable reader yet.
I doubt the S2 can write at UHS-1 speeds. It’s a hardware change to support it so it probably doesn’t appear until later.
As for high capacity SD cards, I vaguely recall testing a 128 GB SDXH card once and it didn’t work. I don’t know if that’s still true with current camera firmware. I believe this is probably just a firmware change and could be added to the S2 if Leica got enough requests.