Using a 2015 27-inch iMac: I need to use an older model analog to digital converter to capture some old VHS tapes. It only has a Firewire 400 port on it so I need to go from a Firewire 400 cable into a Firewire 800 adapter connected to a firewire 800 to thunderbolt adapter. I know that these adapters exist. 1. will doing this degrade the quality of my video in anyway by being converted from FW400 to FW800 to TB? Thanks.