However, in PROG mode the 2S sets aperture from the pre - reading (via the
secondary mirror) and shutter speed OTF. In theory, with a LIN POL, the
aperture could be set too large so that the shutter can't then close in time,
leading to over - exposure. Except in this extreme condition, PROG exposure
should be correct with either type of polariser.
Julian
> from: julian_davies@xxxxxxxxxxxxxx
> date: Wed, 02 Oct 2002 13:29:40
> to: olympus@xxxxxxxxxxxxxxx
> subject: Re: [OM] Polarizer, was Brighter screens and meter readings
> (reprise)
>
> The auto OTF metering is unaffected by a linear polariser, as the effect is
> on the transmission through the primary mirror. Manual and spot measurement
> require a CIR POL, as both measurements are made from the secondary mirror
> after transmission through the primary mirror.
>
> Julian
>
> > from: zuiko@xxxxx
> > date: Wed, 02 Oct 2002 20:22:44
> > to: olympus@xxxxxxxxxxxxxxx
> > subject: Re: [OM] Polarizer, was Brighter screens and meter readings
> > (reprise)
> >
> > On Wed, 2 Oct 2002 14:07:54 0200 "Roger D. Key" wrote:
> >
> > > Note that this system of light measurement throught the semi-silvered
> > mirror requires the use of a circular polarizer filter instead of a linear
> > polarizer filter, to measure exposures correctly in manual mode.
> > >
> > Roger,
> >
> > Is this only for manual mode, or for the spotmetered automatic mode as
> > well? I mean, If I take 3 spotreadings, will my exposure be correct with a
> > linear polarizer on an OM4?
> >
> > Iwert
> > Planet Internet Webmail -- http://www.pimail.be
> >
> > < This message was delivered via the Olympus Mailing List >
> > < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> > < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
> >
>
>
> < This message was delivered via the Olympus Mailing List >
> < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|