The AF sensors are on the floor of the mirror box. The metering sensors are in the prism housing.
--- "D. Glenn Arthur Jr." <[EMAIL PROTECTED]> wrote: > > 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 > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link > directly above and follow the directions. > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
