I finally got myself a second-hand Leaf Aptus 75. Now I'm trying to figure out the newest and largest compact flash cards I can use with this. It has the firmware 4.700 which I think is the latest.
I tried it with an old Sandisk Ultra II 1.0 gigabyte, no problem. A Sandisk Extreme Pro 90 MB/s UDMA6 16 gigabyte did not work so well though, the back locked up. Not sure if it is the speed or the size that is the problem.
Preferably I'd like to use it with a 32 gigabyte 60 MB/s Sandisk Extreme UDMA, but I'm not sure if it will work. Before ordering one I'd like to ask here and see if there is any Aptus user that knows. I know some old Phase backs has 8 gigabyte limit, haven't found similar information about Leaf backs though.