Gene, I had a similar issue recently. I haven't been able to find a Thunderbolt to 4-pin Firewire cable anywhere.
To my knowledge, the only Thunderbolt to Firewire adapter that exists is for 9-pin Firewire (it goes for about $30.00 at Apple stores). I then use a 9-pin to 4-pin Firewire cable to connect to my DV deck or DV camera. There are definitely other combinations of adapters that are possible, but this system seems to be one of the most efficient solutions, and has been working very well for me. I'm finding that Apple has been increasingly poor at supporting 4 or 6 pin Firewire cables as they continue to add more bells & whistles. Their new laptops don't even have DVD/CD disk drives anymore. Their new display options are "easier," yet less specific, hold far fewer possibilities, and give the user less agency in fine-tuning for projection. Once Apple changes to their new audio output in lieu of mini cables and outsources most of their storage to Cloud-based models, I feel like they might alienate their original core audience - artists/designers/musicians/film & video makers. I understand that we need to "change with the times," but the cost is very high and holds danger for losing significant quality and control. I might be opening a can of worms here, but it's something I've been struggling with a lot lately as a maker and as an exhibitor. Aside from that tangent: good luck, Gene! Cheers, Kate Ewald
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