Alin Flaider explained:
>    Judging by the migration of TTL flash sensors from single-segment
>    OTF located under the mirror to multi-segment
>    off-the-focusing-screen housed in the pentaprism, I'd say the
>    latter. 

#blink#  Uh, how does that work?  Isn't the focusing screen 
blocked by the mirror during exposure?  What am I missing?

                                        -- Glenn

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