Canon manual 62

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data will be displayed in the viewfinder. Unless the shutter speed data is flashing on and off, simply press the shutter button for an accurately exposed image. Exposure warnings are exactly like those in aperture priority AE. Set the aperture ring to a larger aperture if a shutter speed of the slow range flashes on and off in the viewfinder. The shutter speed value that flashes to indicate underexposure depends on the ASA film speed. Set it to a smaller aperture if the highest shutter speed of “1000” flashes on and off. When the shutter speed flashes on and off even when the aperture ring is turned to the extreme limits, you are outside the meter coupling range. Change the light level or switch to a more appropriate film.

Since you can determine correct exposure simply by watching the shutter speed data in the viewfinder, you need not keep an eye on the lens aperture ring as you turn it. How- ever, for good depth of field when using accessories for close-up photography, it is best to close the lens to a relatively small aperture. More details are given in the instruction booklets for the various accessories involved.

You will find that your A-1 is unusually effective in photomacrography and photo- micrography. Even though the amount of

light reaching the film plane is greatly reduced due to attached accessories, the A-1 is capable of metering as low a light level as EV-2 (with ASA 100 film) in the stopped- down AE mode. Furthermore, since the A-1 employs a through-the-lens meter, no exposure correction is necessary when accessories are inserted between camera and lens.

When you are finished operating in the stopped-down AE mode, unfold and press down on the stop-down lever. It will pop out and the camera will be reset for full aperture metering. With an FD lens, you can now return the lens aperture ring to the “A” mark if you wish to use the A-1 in a full aperture metering AE mode.

If you return the aperture ring to “A” but leave the stop-down lever pushed in, the camera will remain in the stopped-down AE mode and all subsequent exposures will be made at the lens minimum aperture. Though exposure will be correct, this situation severely strains camera mechanisms and is not recommended.

When performing stopped-down metering, you also have the advantage of being able to confirm depth of field directly in the view- finder. See Checking the Depth of Field.

It is not possible to shoot sequentially with the Power Winder A or A2 or Motor Drive MA when in the stopped-down AE mode using an FD lens. In this situation, only single-frame power winding is possible.

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