Nikon LS-4500AF User Manual page 50

6. Using the Film Holder
Step 4
The arrow indicates the scanning direction. Set the image angle by rotating
the turntable.
For fine adjustment, refer to the angle index marked on the edge of the
turntable. The index may not match over the entire circumference.
Turntable
Arrow
Note: When rotating large-sized film, the length may exceed 5 inches, and
scanning of some part of the film may be impossible.
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Film Scanner LS-4500AF User's Manual