Hi Thomas,
I´ve not too much experience with hand held metering so far .... :-(.
But I remember to read some advice in an old "how to
Photograph" book, from one of the "old-masters" (I'm not sure was it Feininger
or
Addams, ... doesn`t matter).
But he strongly recommended not to use TTL-meassurment with any type of
filter at all. Instead meassure with a hand-held-meter and calculate with the
given
(or figured out) fixed filter correction factor, e.g always +1.5 F-stops for
filter blabla...
This advicve seem`s strange at first. But the explanation is convincing.
All TTL-measument with filters compensate the desired filter effect (at least
partly)!
An example, when you use a polarizer to darken the sky. A TTL-meter faultly
indicates
different exposure when rotated. - Guess this is what makes you ask this
question.
The problem is:
The more you turn the filter to darken the sky the more the TTL-metering-System
increases the exposure value to get a correct 180icture from the sky....Uups...
:-(.
(This is not always obvious, when there is a large Subject, which is not affeced
by the filter, in the central-meassure area)
This is one reason why I´m thinking to get a hand-held-meter, despite the
fabulous
OM-spot metering capabilities.
As usual the best thing is to get your own experience
with compairing test-shot`s and the deciding which way is personal best to get
the
desired resultat. An then share your experiences......
Frieder Faig
On Thu, Jun 22, 2000 at 01:41:57AM +0200, T.Clausen@xxxxxxxxxxxx wrote:
> Hiya all,
>
> I have a selection of circular polarizers, which I have been happily using
> on my Zuikos (nice with zuikos: 49 & 55 mm does almost all) with the
> various Olympi cameras.
>
> No problems whatsoever - the ttl metering has always worked fine.....
>
> Now, however, I have (as some may remember) bought a hand-held meter -
> which I have started to use a bit for various "difficult" motives (and for
> getting experience using said meter). Until now I have not been using the
> pol-filters when using the hand-held meter, but that is only a matter of
> time (praticing using the flash-meter part is next, in which case it will
> become handy with pol-filters).
>
> I have noticed that when using the pol-filter, the TTL meter in the OM's
> indicate 1-2 stops lower than without the filter. This makes sense, since
> the pol-filter is intended to reduce the amount of light according to the
> lights polarization. However applying that information directly to the
> meter readings done with the hand-held meter somehow doesn't seem right to
> me. I'd imagine e.g. that the ratio of the reflected light going through
> to the film depends quite a lot on the polarization of said light & the
> position of the filter, and that no general rule can be applied regarding
> the reading on a hand-held meter when using filters.....
>
> However I am sure that the collective knowledge and reasoning of the
> list-members may contain some valueable input on this. So what are the
> general experiences when using a hand-held meter + (various) filters (for
> now, mainly pol-filters)?
>
> Thanks in advance.
>
> --thomas
>
>
>
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