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Positioning Pin
Automatic Aperture Lever
Rear Dust Cap
The rear dust cap must be removed before mounting the lens.
Operation with an FD lens which lacks a chrome
The rear dust cap for this type of lens has serrated edges. Do not mount a rear dust cap which lacks the serrated edges.
Removal from lens
1.Turn the cap counterclockwise until it stops.
2.Pull the cap out.
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
Removal from Lens
1.Turn the lens' 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 diaphragm blades are also locked and will not move even if the aperture ring is rotated.)