Canon F-1 Instructions Manual page 46

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Lens Hood
When shooting into bright light, light rays entering the
lens may form defects on the image called ghost and
flare. Attaching a hood onto the lens helps to prevent
this. Bayonet-mount hoods are available as optional
accessories for most Canon lenses. Please use only that
hood which is specified for the lens concerned. This
type of hood fits into the bayonet mount at the front of
the lens where it is fixed by turning until it is tight.
Some hoods for wide-angle lenses require proper posi-
tioning before mounting. Align the red dot on this type
of hood with the notch in the bayonet mount at the
front of the lens. Then lightly push the hood into
the mount and turn it until it is tight.
When not in use, the hood can be mounted in
reverse on a standard or some wide-angle lenses, in which
case even the hood will fit perfectly into the camera's
case.
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