Sony FVS-1000 Series Operation Manual page 20

Film Loading
To set the core retainer and film protector
Prepare the cores on the supply and take-up sides
according to the film size to be used.
35-mm film: Attach the 35-mm core.
35-mm core
16-mm film: Attach the 16-mm core and core
retainers, as shown below, then pull the film protector
up.
16-mm core
18
Settings when the BKFV-500 is installed
When the BKFV-500 is installed, and audio signals are
to be processed, the switch must be set according to
the film size, as shown below.
Film protector
Core retainers
Film protector
Switch