J. C. O'Connell <[EMAIL PROTECTED]> wondered:
> never really thought about it 'cause I aint into AF but do ANY AF
> systems stay active once the shutter opens? & Why?
I don't know where the AF sensors are, but I'm betting that they're
in the prism ... if I'm right (sanity check anyone?) then AF can't
be _effective_ with the mirror up, but may or may not still be turned
on despite not being able to do anything.
Though now you've got me wondering about AF systems in non-SLR
bodies, and how your question applies to those.
(By the way, I was trying to sneak up on a bug earlier, and in
the process I discovered that the autofocus didn't want to work
when too much light was coming in through the viewfinder. I had
the camera away from my face, and the darn thing wouldn't fire
even though I'd had trap focus working just fine seconds earlier.
Then I waved my thumb over the viewfinder and the shutter fired.
Innnteresting.)
If I were naively designing a DSLR, I might not bother de-powering
the AF subsystem during an exposure because the time involved would
be too short to really worry about (unless the AF could become
confused while the shutter was open and try to shift focus during
the shot), but on 'bulb', the times are a lot longer, and Pentax
designers are not naive. So I wanna know what they did. (And
whether it happens upstream or downsteam of the cable-release
conector -- i.e. whether it works automagically or the cable release
has to fake it.)
-- Glenn
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