On Mon, 17 Jan 2000, Joseph wrote:
> I have not observed any evidence that I need to use a circular polarizer with
> an OM-4T. If I use the camera to spotmeter an area of a scene without the
> filter on, and then attach the filter and re-meter the same area, I get
> a difference in meter readings corresponding to the loss of light
> due to the filter factor. Thus, I have not been able to observe an
> effect on the accuracy of taking a meter reading, hence I don't know
> what is meant by the circular polarizer affecting manual exposure.
I think you meant "linear polarizer affecting manual exposure" in that
last sentence - circular polarizers should have not affect manual
metering.
However, assuming you tried the experiment with a linear polarizer, I'd
be interested in the results of repeating the experiment with the filter
at different rotations. The half-silvered part of the mirror is
effected by having alternate silvered/unsilvered strips, much too small
to see, which makes it act like another linear polarising filter. Hence
you should see a change in meter reading as the filter is rotated, even
when the light from the subject is randomly polarised.
--
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