Hi(Bonjour)
Hum Luis, you're right. Being away from my work station, I've made a mistake in adaptor description and forgot the belkin cable. Thank you for your eagle's eye.
Here's the exact Apple part numbers of my setup:
1) Connected to FireWire 400 IEEE 1394a camcorder's port: A Belkin Firewire 800/400 9 pin to 6 pin cable
2) At other cable's end: A Firewire 800 to Thunderbolt 2 adapter, part model A1463
3) Connected to the first adapter, A Thunderbolt 3 (USB-C) to thunderbolt 2 adapter, part MMEL2AM/A
4) Connected in my iMac Thunderbolt 3 port.
