[pure-silver] Re: filter factor

The correct way to determine a filter factor is to photograph an 18% grey card with and with out the filter. Then measure the density of each image and determine the LogE difference from the D-logE curve you would get from the process because how you process is important. Now who is going to do that? Meter reading is Kentucky windage. Works for me as I get older.

Dave

----- Original Message ----- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, September 29, 2006 3:56 PM
Subject: [pure-silver] Re: filter factor


Since I don't know what brand meter you have or its age, let me warn
that trying to determine your own filter factor is iffy because your
meter's sensor may not be equally sensitive to all wavelengths.  This
was a problem years ago when SLR's first started including meters.
Metering with the filter in place often produced the wrong exposure.
Today's meters have a better spectral response.

Jerry

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Shannon Stoney
Sent: Friday, September 29, 2006 3:09 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] filter factor


I just bought a Hoya yellow K2 filter for a view camera lens.
(Luckily it also fits my medium format camera.) I held it up in front
of the spot meter today while metering  shadow areas, and it read a
third of a stop less than without the filter.  So, does that mean my
filter factor is 1.3?

--shannon
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