Canon F-1 Instructions Manual page 11

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Reattachment
1
Align the arrow on the cap with the red dot at the
rear of the lens.
2
In that position, apply slight pressure to the cap and
turn it clockwise until it is tight.
Operation with an FD lens which has a chrome
Breech-lock mount ring or with an FL lens:
Removal from Lens
1
Turn the tens' mount ring clockwise until it stops.
2
Pull the cap out.
Once the rear cap is removed, the Breech-lock mount
ring is locked so that it cannot be turned. (The dia-
phragm blades are also locked and will not move even if
the aperture ring is rotated.)
Reattachment
1
Make sure the mount ring is locked so that it cannot be
turned.
2
Align the arrow on the cap with the red dot on the lens'
mount ring.
3
In that position, push lightly down on the cap and
turn the mount ring counterclockwise until it is tight.
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