RE: [OM] T20 flash and red-eye

[Wayne Harridge]

        Matthias,

> The trick with pre-flashes and stopped down irises is, that because of the
> stopped down iris less light reaches the red retina. So the inner part of
> the eye keeps dark enough not to be detected by the film.
> 
> 
        How long does the iris take to stop down ?

        What are the dependencies ?

        ...Wayne


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