You should check before buying a CF card, what format the camera supports. In my case, was the manual only CF I & II, but without specifying GB. My Sony Alpha 100 is from 2006 and was the first SLR from Sony, so it was already an element of risk to take 16 GB, but it works flawlessly. One should nevertheless not overdo with the memory. Clear are 32, 64 and 128GB in CF III format tempting, but if the driver of the camera so clear is the question.