Canon AE-1 Manual page 29

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scale and the distance scale on the lens barrel. Both are closely interrelated.

Infrared Index Mark The red dot infrared index mark engraved on the lens barrel is a

focusing correction index mark for infrared film. Because infrared light rays have longer

wavelengths, they focus on a plane slightly behind that of ordinary visible light rays.

For instance normally, when the focus is adjusted at 5m on the distance scale, you turn the

focusing ring slightly so that the 5 on the distance scale matches the red dot infrared index

mark. When photographing with infrared black and white film, visible light rays must be kept

out by means of a deep red filter (R1) over the lens. Set the aperture ring manually following

the film manufacturer's suggestion for exposure settings. However, this does not apply when

color infrared film is used' so please follow the directions of the specific instructions of the

film manufacturer when performing infrared color photography. The infrared index mark is

engraved in a position based upon the conclusion arrived at through experiments that the film

most sensitive to the 800m,u wavelength is to be used with a red filter. For example, the

Kodak Film IR135 and the Wratten Filter 37.

Speedlites, Accessories, Care, Maintenance and other issues.

After it flashes, the camera automatically switches over to the AE photography mode until the

pilot lamp lights up again during which period AE photography can be continued. A steady

support may be required if shutter speeds are slower than 1/30 of a second. Like ordinary flash

units, you can also perform flash photography by operating the aperture ring manually. When

you are using a Canon FL lens which does not allow full aperture metering, automatic flash

photography can be performed by setting the prescribed f/stop on the lens manually. In both

cases, the shutter speed is automatically adjusted to the X synchronization speed of 1/60 sec.

As the time of its introduction, there is a 'dedicated' flash unit in Speedlite 155A, which uses a

unique averaged light sensing system which keeps down the distribution of the reflected light

Therefore, it is necessary to slightly modify the normal method of focusing the lens. After

focusing the same as usual, note the tiny red dot engraved on the lens barrel just to the right

of the distance index and turn the focusing ring slightly to align the focused distance with

this red dot.

The versatile circuitry of the Canon AE-1 allows it to perform fully

automatic flash photography with the Speedlite 155A especially designed

for this camera. It is not necessary to set the shutter speed or the aperture

on the camera as, up to now, flash photography required. When the 155A

is attached to the AE-1, set the aperture ring of the lens to the "A" mark

and the shutter speed dial to any position other than "B" (Bulb). With the

pilot lamp of the 155A lighting up, the 155Afunctions to automatically

adjust the camera's shutter speed to the X synchronization speed as well

as the aperture to the prescribed f/stop value.