Canon manual 81

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Automatic Diaphragm Control

When the A-1 is directly coupled with an FD lens, diaphragm control is totally automatic. Exposure metering is performed at full aperture whether the lens aperture ring is at the “A” mark or set to a specific aperture. At shutter release, the diaphragm automatically closes down to the aperture set by the camera or by you with the AT dial or the aperture ring. Following shutter release, the lens automatically returns to maximum aper- ture.

Manual Diaphragm Control

The insertion of manual accessories or a macrophoto coupler between the camera and an FD lens requires setting the lens for manual diaphragm control before stopped- down metering is possible. The instructions for the various accessories involved will tell you whether or not this is necessary.

All FD lenses which lack a Breech- lock mount ring, with the exception of the Macro lenses, are set for manual diaphragm control as follows:

1.Before mounting the lens, insert the hole of the accessory manual diaphragm adapt- er over the tip of the automatic aperture lever at the rear of the lens. Push the lever to the right and lower the adapter into the groove to lock the lever in that position.

2.Mount the lens onto the accessory. The diaphragm will now open and close as the aperture ring is rotated.

When the manual diaphragm adapter is attached on the rear of one of these lenses, never mount the lens directly on the camera or directly on accessories designed for automatic diaphragm control, such as the Auto Bellows or Bellows FL.

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