[pure-silver] Re: estimating filter factor: gray card?

 
 
In a message dated 9/30/2006 11:50:40 A.M. Eastern Daylight Time,  
zentena@xxxxxxxxxxxx writes:

It's easy to use it for adjustment. Just divide your film speed by the filter 
 
factor. 



I don't think you're right about this, perhaps you  are.  This method would 
imply a relationship between filter and film  speed.  I don't think there is 
one.  The light is affected by the  filter prior to striking the film.  It does 
not matter if it is "fast" film  or "slow" film.
 
Bruce  Osgood
Camclicker @ aol.com
Brooklyn,  NY.

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