>A circular polarizer is only required for spot metering operations
>which employs the beam splitter. Circular polarizers are required for
>AF cameras for the same reason.
On the 4 and 3 series, all metering is performed with the sub mirror
assembly. The 4 on auto will meter once the mirror flips, but the 3 and 4 on
spot or manual need the circular polariser.
Foxy
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