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20 METER COUPLING RANGE
20 Meter Coupling R ange
With an FD 50mm f/1.4 lens and ISO 100/21
◦
(ASA 100/21 DIN) film, the New
Canon F-1’s built-in exposure meter couples within a range of EV.- 1 (4 sec. at
f/1.4) to EV 20 (1/2000 sec. at f/22). In aperture-priority AE or stoppeddown AE,
the coupling range is EV-1 to EV 19 (1/1000 sec. at f/22).
EV (Exposure Value) is a numerical value of exposure which is based on proper
combinations of shutter speed and aperture. The camera’s EV coupling range varies
with lens speed and ISO film sensitivity.
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