[pure-silver] Re: estimating filter factor: gray card?
- From: Camclicker@xxxxxxx
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sat, 30 Sep 2006 10:35:51 EDT
In a message dated 9/30/2006 7:55:15 A.M. Eastern Daylight Time,
sstoney@xxxxxxx writes:
I can't really bracket when shooting large format film.
I am thinking that although the filter factor is supposed to be 2,
that seems excessive to me given that it only changes the reading by
a third of a stop. I am thinking something like 1.5 would be more
accurate.
I wonder if it's better to meter a gray card, rather than meter the shadows?
--shannon
I'm joining this thread late and don't really know what went on before
but.... the factor indicated by an X on the filter ring and is only a factor,
not
an adjustment. The adjustment is the Sq. Root of the factor: 5 X factor =
2.24 stops. A filter factor of 2 X = an adjustment of 1.41 stops (close
enough to your gut feeling). The adjustment can be made in either time or
aperture.
I suggest after composing your scene you put the selected filter on the
camera lens and spot meter the scene as usual. When setting f-Stop and Time
make your adjustment for filtration and take the picture.
Bruce Osgood
Camclicker @ aol.com
Brooklyn, NY.
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