Kodak RFS 3570 - Manual (Page 125)

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 Loading the Film and Slide Holders — PC G 8-11
2. If the single-frame holder adapter is not in the Scanner, put it in place
in the Scanner.
KOD AK Professional
RFS 3570 Film Scanner
Single-frame
Holder Adapter
. . . insert if not already
in Scanner.
The slots on both ends . . .
. . . wrap around
the frame in the Scanner.