In article , R. Lee Hawkins <lhawkins@xxxxxxxxxxxxxxxxxxx> writes
>In your message dated: Tue, 31 Mar 1998 20:47:42 EST you write:
>
>>To test John's recommendation, I took my OM4T w/ 100mm f2.8 and an old OM
>>linear polarizer outside and metered against my house. In BOTH Average and
>>Spot the meter changed when rotated about +1&2/3 stops from 1/125 sec to
>>almost 1/500 sec.
>
>Yes, but the meter readings you see in "average" mode in the OM-4 are
>only appoximate. When you actually take a photo, the metering is OTF,
>so it doesn't matter what you have on the front of the lens (as long as
>it transmits light :), the exposure will be correct. The problem is
>that when you spot meter, the reading is taken through the partially
>silvered mirror, and locked in.
Lee, this is a problem in either MANUAL metering mode - SPOT or AVERAGE!
In manual metering ALL measurements are made through the semi-silvered
mirror and subject to the self-polarisation of such devices, thus
changing as the polariser aligns with and crosses the mirror axis,
--
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers (replace 'nospam' with 'kennedym' when replying)
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