Oce 3122 Manual page 214

When making copies from larger size film (e.g.
6 x 6, 6 x 7):
Using a cutting knife cut out the center of the
positioning sheet (supplied) to the same size as the
film.
Place the film to be copied so that the front side is
facing up and aligned with the position of the cutout
window on the positioning sheet. Then, place the film
between the two sheets of film in the 4 x 5 film
holder.
8 Place the 4 x 5 film holder on the Fresnel lens.
Place the 4 x 5 film holder between the Fresnel lens
and platen glass, and close the Fresnel lens making
sure that the 4 x 5 film holder is positioned in the
center of the Fresnel lens.
(When the 4 x 5 film holder is at the correct position,
the protrusions on the leading edge of the 4 x 5 film
holder fit into the indentations on the non-operator
side. This prevents the 4 x 5 film holder from moving
to the left or right.)
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Océ 3121 – Copying Manual – English