[LargeFormat] polarizer compensation

[Jim Brick]

My Gossen meters (Luna Star F2 & Luna Pro Digital) will take a reference 
reading through filters and set their internal offset to the value that 
they saw reading through the filters. I have always used this method and it 
seems to be spot on for my purposes.

I recently was using ISO 100 film (Provia 100F) and wanted to get down to 
several seconds exposure (silky water,) out in the bright sun. I used a 1.8 
ND (6 stops) and a polarizer (~2.5 stops). I read the two through my meter 
to set the offset. Then read the scene and got 4 sec at f/32, which was the 
correct exposure. I bracketed + and -, but the indicated meter exposure was 
the correct exposure.

Jim


At 06:30 PM 11/11/2002 -0800, Brock Nanson wrote:
>Here's a quick one that will undoubtedly bring a variety of responses!!
>What do people use for a typical exposure compensation for a Polarizing
>filter?  I've seen 1.5 to 2 and a bit stops... I've always gone with 2 but
>wonder if 1.5 might brighten the shadow somewhat, without lightening the sky
>too much.  Is there a difference between circular and linear w.r.t. neutral
>density?
>
>While we're on the subject, what about a typical red filter for black and
>white?  A 25 I think it is (?).
>
>Brock
>
>
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