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

DEAR BRUCE,
           He is not implying a relationship between filter and film speed,
he is stating how to adjust your meter to take the filter factor into
account.  This way you don't have to do your readings first and THEN either
divide the shutter speed by the factor or convert the factor to stops and
then adjust your aperture.  It is just simpler to divide your film speed by
the filter factor and put this number into your meter.
********The downside:  If you vary your filters often (including no filter),
you MUST remember to change the ISO setting each time you change your filter
or you will get some SERIOUS over and under exposures.
                      CHEERS!
                                BOB

 Please check my website: http://www.bobkiss.com/ <http://www.bobkiss.com/>

"Live as if you are going to die tomorrow.  Learn as if you are going to
live forever".  Mahatma Gandhi

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx]On Behalf Of Camclicker@xxxxxxx
Sent: Saturday, September 30, 2006 12:37 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [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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