A question occurs. Seeing that circular pols. work with everything and
linear/top pols. are limited, why do the top manufacturers like B+W and
Heliopan continue to make linears? Is it just for economy - they're about
30 heaper - or is there a situation where a linear is actually better?
AndrewF
><< The OM-{1(N), 2(N),
> 10, G, and F) do not have a semi-silvered mirror, and can thus
> use linear polarizers without any problem. This problem
> reportedly only affects the spot metering modes of the OM-{2S,
> 3(Ti), 4(Ti), PC and probably OM-2000}. >>
>
>The second sentence of that statement would implicate the secondary 'Fresnel
>lens' mirror as the main culprit I would say. The main semi-silvered mirror
>might also contribute to the error.
>
>In that case, manual with average metering would be off, and manual in spot
>mode might be even more off, but again, the error will likely vary as you
>turn the linear polariser round! YUK!
>
>Auto in spot mode might be off too, since the spot readings are taken with
>the mirrors down - it will depend on if or how the shutter blind /
>Off-The-Film readings modify the exposure after the mirror is raised! YUK!
>YUK!
>
>Too complicated by half!!
>
>A circular polariser might save you loads of hassle and worry!
>
>Dave Bellamy.
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