Hey, Bryant. We are on a roll here. Don't confuse us with facts. ;-) You
are right, of course. Forgot about the little secondary mirror having to
get out of the way when the shutter is tripping.
>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
>
>----------
>From: Winsor Crosby <wincros@xxxxxxx>
>To: olympus@xxxxxxxxxxxxxxx
>Subject: Re: [OM] OTF in IS-3?
>Date: Tuesday, February 24, 1998 11:45 PM
>
>>-----Original Message-----
>>From: Ken Norton <kenorton@xxxxxxxxxx>
>>
>>>Light entering the viewfinder DOES effect metering.
>>>
>>>Ken Norton
>>>
>>Other than the OTF metering during exposure, light through the viewfinder
>>can get to nearly all normal SLR TTL meters. Without a one way mirror in
>the
>>viewfinder, light can go from the viewfinder to the mirror just as easily
>as
>>from the mirror to the viewfinder. It can then travel through the partial
>>mirror down into the meter. The mirror seals the viewfinder during OTF
>>exposure. I am surprised that the IS-3 doesn't have OTF flash metering,
>but
>>John H. says no. For its intended usage, it really isn't needed.
>>
>>Doug
>
>Except that the light travels different paths. Light from the viewfinder
>would come straight down to the mirror, throught the partially silvered
>area and straight to the bottom of the camera. Light from a lens goes
>straight, horizontally, through the partially silvered area of the main
>mirror and is reflected off the secondary mirror so that it does not go
>straight down but goes forward as well as downward so that it can reach the
>recessed light sensing element that is designed to face rearward and
>frequently is used to read reflected light off the film and shutter curtain
>as well.
>
>
>
>Winsor Crosby
Winsor Crosby
Long Beach, California
mailto:wincros@xxxxxxxxxxx
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