>I just tried setting my OM-4T to ISO 3200 and setting the lens to f/2.8.
>
snip
>I assume the OM-4T uses a photo diode for its TTL (ie, off the focusing
>screen) readings. Any photo diode will have a very weak output, even in
>"zero" light. * This is (probably) why you get a reading even when the
>lens is capped.
>
The exposure time (measurement accuracy) is stated at 100 ASA film. I think
it gets shorter with faster film.
Foxy
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