Hi Chuck,
The underlaying reason is that in auto mode these cameras determine
the shutterspeed during the actual exposure (= off-the-film metering).
This doesn't go through the mirror so they would be OK using a linear
filter. O.t.o.h. to make things complicated: the shutterspeed
indication (and it really is only an indication in auto mode) probably
would be thrown off by a linear filter though!
The OM-2S/P in manual mode (= spot measuring mode) measures before
exposure, and measures through the mirror, hence requires a circular
pol filter to measure (and indicate) correctly.
The same thing goes for the OM-4(T(i)) in manual mode and in spot
metering mode and the OM-3(T) in any mode: they measure through the
mirror, so require a circular pol filter.
Hope this all makes sense to you. :)
If it doesn't make sense you can prevent confusion by either of these methods:
* toss all your pol filters
* toss all your linear pol filters
* toss all your OM- 2S(/P), 4(T(i)) 3(T) bodies
Cheers,
Bart
On Tue, Feb 1, 2011 at 3:23 PM, Chuck Norcutt
<chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> For reasons I don't understand the Oly manuals for the 2s, 4T only
> "require" a circular polarizer in the case of spot metering.
>
> Chuck Norcutt
>
>
> On 2/1/2011 3:27 AM, Andrew Fildes wrote:
>> Yes, although all' is a big word! :-)
>> But does that affect exposure metering, which was the issue with film
>> cameras?
>> Andrew Fildes
>> afildes@xxxxxxxxxxxxx
>>
>>
>>
>> On 01/02/2011, at 4:50 PM, Ken Norton wrote:
>>
>>> Yes, Andrew. All mirrors in DSLRs are semi silvered to pass through
>>> the light to the submirror for the autofocus sensor.
>>
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