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All FD lenses with a chrome Breech- lock mount ring and FD Macro lenses are set for manual diaphragm control as follows:
1.Before mounting the lens, push the automatic aperture lever at the rear of the lens to the right where it auto- matically locks.
2.Mount the lens onto the accessory as usual. The diaphragm will now open and
close as the aperture ring is rotated. Some of these lenses have an additional lock lever. With these lenses, the automatic aperture lever must be pushed fully to the right and the lock lever pushed to “L” to hold the automatic aperture lever in that position.
When using a macrophoto coupler, the Macro Hood must also be mounted onto the rear of the lens.
You may avoid setting the lens for manual diaphragm control when using manual accessories or a macrophoto coupler by attaching the Canon Macro Auto Ring and/ or Double Cable Release.
Be sure to reset the automatic aperture lever to its normal position before using the lens once more in direct contact with the camera. In the case of a lens with a lock lever, switch it back to the position of the white dot.
To meter when the lens is set for manual diaphragm control, use the