That’s the beauty of the IMAC, is it’s portability. It’s curse is, it’s not very expandable. The reason you need a macpro to lay back to Beta SP, is that you need your storage on it’s own bus, and you need your IO on it’s own bus. If you have a Sata RAID attached to a pci bus, and a Kona card on it’s own pci bus , or even an IO (which is firewire based) they will have their own dedicated bus to provide the throughput necessary to layoff to betacam sp.
The IMAC will only give you firewire, and it will share the same bus, which means your hard drives and io will be fighting for that throughput and it just won’t work. If not, you could export your footage to a self contained quicktime and take it to a post house that can lay it off for you, but I don’t believe you’re going to be able to do it with an IMAC.
As you mentioned, you could do it with a Kona card. Mind you, not a Kona 3, as that is digital only and won’t connect directly to a UVW-1800 unless you get an SDI to Component decoder, which is yet another expense. You also cannot put a Kona 3 in an IMAC, so your only IO option is the IOHD, but you’re still left with the issue of throughput from your hard drives.
I strongly recommend you take it to a house to downconvert from the D5 master, especially since it was color corrected on a Da Vinci. You’ve already spent significant money making this look nice, and all these workarounds you’re considered would tend to defeat the purpose of all that.
Richard Sanchez
North Hollywood, CA
“We are the facilitators of our own creative evolution.” – Bill Hicks