Canon New F-1 Instruction Manual page 31

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16 EYE-LEVEL FINDER FN
Underexposure Warning
The position of the red underexposure warning mark is determined by the lens'
maximum aperture. If the meter needle points to the underexposure mark, choose
a slower shutter speed until the needle moves away from the mark.
Overexposure Warning
The red marks next to 32, 22 and 16 in the aperture scale are overexposure warning
zones. If the meter needle points to one of these zones, check the lens' minimum
aperture. If, for example, the meter needle points to the red zone between f/16 and
f/22 and the minimum aperture is f/16, turn the shutter dial to a faster speed until
the meter needle points to an aperture of f/16 or larger.
16.1 Match-needle Metering
Overexpsoure warning zone
Underexposure warning zone
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