This plate, a front surface mirror, reflects light down to the averaging/spot
sensor. As the mirror starts to move, exposure info is locked into memory
until the shutter fires.
John
Bryant Wetzel wrote:
> Sorry to interject here, but has anyone actually put the camera on B and
> held the shutter open, (mirror up) while looking inside. Anyone notice the
> back of the mirror assembly is actually a metal plate with a flap that
> retracts when the mirror is up?
>
> Just wondered?
>
> Bryant
>
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