I'm sorry to hear about Narikin's problems with the Sigma software in Windows. I run Windows 7 64-bit, and have had the Sigma software convert a large number of Raws to tiffs in one fell swoop, without any problem, then process them in ACR. The conversion is an extra step, and the camera is indeed slower than any other DSLR I've had (except for the Sigma DSLR), but as has been said, "the results are worth it." This is one sweet camera (just keep some extra battery power on hand). I'm grateful to Quentin's initial posting and Michael's early comments, without which I wouldn't have bought it, and have been enjoying the results ever since. And just look at how many views this thread has had!! --Barbara