Epson Expression 1680 Reference Manual page 79

You are now ready to scan the slides using your scanner software.
Note:
Make sure to select TPU for Neg. film or TPU for Pos. film as the
Document Source setting in EPSON TWAIN Pro.
When TPU for Neg. film or TPU for Pos. film is selected as the
Document Source setting, the focus position is automatically set to
2.5 to accommodate the use of the film holders.
120/220 film
1. Place the 120/220 film holder on a flat surface, and open a
strip cover.
2. Insert the film in the film holder, making sure the glossy
(smooth) side of the film is facing down.
4-10
Options