Canon PIXMA MP800 User Manual page 67

Mounting 35 mm Slides:
(1) Align the film guide with the indentations on the right and left sides of the Platen Glass.
(2) Mount the slides in the film guide with the front side (the side showing the correct image)
face down, the frame order running from left to right, and with the image upside down.
Load the slides in the landscape orientation, making sure they are not loose in the film
guide.
Important
Chapter 4
The images may be unsatisfactory if the film is set beyond the reference
position (A) indicated by the white line. Do not set the film beyond the
reference position.
Photo Printing from Photo or Film
(A)
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