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

On Saturday 30 September 2006 10:35, Camclicker@xxxxxxx wrote:

>
> 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: 
> 

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

        Nick
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