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Re: [OM] - Brighter screens and meter readings (reprise)

Subject: Re: [OM] - Brighter screens and meter readings (reprise)
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Wed, 2 Oct 2002 10:13:24 -0400
OM-2 /2N have 2 sbcs, the 2S, 3, 3Ti, 4, 4T, 4Ti have one cell pointing
backward.
_________________________________
John Hermanson  www.zuiko.com
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 For Free Olympus manuals,
please call 1-800-221-3000
_________________________________
----- Original Message -----
From: <flowerside@xxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Wednesday, October 02, 2002 9:29 AM
Subject: Re: [OM] - Brighter screens and meter readings (reprise)


>
>
> > The OM-2SP and OM-4Ti measure light through the same
> > two SBC sensors in the light box during both viewing and
> > the taking of a photograph. When viewing, light is
> > measured through a semi-silvered section of the main
> > mirror, via an additional mirror that hangs down from the
> > back of the main mirror.
>
> After reading the OM-3Ti / OM-4Ti manuals which can be found on th e-sif
site, I noticed that only the OM-3Ti manual (in the section "Creative
Photography") explains - with a camera diagram - how does the center
weighted light measurement work, and this involves passing the light through
the semi-silvered mirror to the light sensor via the auxiliary mirror. Same
procedure is used for the spot measurement, but the area metered is narrower
as the proper diagram shows.
>
> Of course, in the OM-3Ti manual, there is no mention to the OTF light
measurement method.
>
> The diagram showing how to take the center weighted metering with the
OM-3Ti is not reported on the OM-4Ti manual. In the latter one, indeed,
there is a short description of the OTF light measurement method, but there
is no direct mention to the metering  technique used when evaluating the
shutter speed to show in the viewfinder.
>
> Should we suppose that, OTF measurement apart, the two cameras apply the
same method when evaluating the shutter speed to show in the viewfinder in
C-W mode, as your experience should suggest?
>
> And for what concerns the two SBC cells which are supposed to be in the
light box, how are they arranged? Does the sensor for the center-weighted
estimate have a donut-like shape, with the smaller sensor (the one for the
spot measurement) inside its "hole", or are they overlapped and the
electronic circuit chooses which one to use depending on the metering mode?
>
> If this ain't the case, I can't figure out how can the two sensors be
placed...
>
> I know all this talking has no practical consequences, and I do apologize
if my questions sound too repetitive, but I have to admit that I'm damn
curious! :)
>
> Ciao!
>
> Fabio
>
>
> -----------------------------------------------------
>
> Salve, il messaggio che hai ricevuto
> è stato inviato per mezzo del sistema
> di web mail interfree. Se anche tu vuoi
> una casella di posta free visita il
> sito http://club.interfree.it
> Ti aspettiamo!
>
> -----------------------------------------------------
>
>
>
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