Epson PERFECTION 1640 SU Reference Manual page 107

2. Load the transparency to be scanned face down on the
scanner's document table in the window of the Film Adapter
as shown below.
Loading 35 mm strip film
If you are scanning 35 mm strip film, use the 35 mm film
holder to set the film.
Note:
Place the film holder on the document table in alignment with the
upper left-hand corner of the Film Adapter.
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