Of course. I hadn't thought about spot metering equating to manual and
average metering to auto mode with the mirror up. But it is surprising
that the manuals don't mention erroneous exposure info in the viewfinder
in auto mode with a linear polarizer.
Chuck Norcutt
On 2/1/2011 9:46 AM, Bart Wientjes wrote:
> 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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