Hi all, I've been attempting to establish an accurate exposure index for Kodak HIE by using my Zone VI spot meter with an 89b opaque filter in front of the lens. I establish a "zone 'V'ish location in the scene to be photographed, like a patch of green grass, and I take a spot reading with and without the 89b filter.
Strangely enough, the readings only drop about one stop when I read the same scene with the filter. This violates all my known (allbeit limited) sensibilities about what should happen. If this filter is blocking everything below around 720nmm, and this filter is altered for zone system use by limiting everything above and below (approxmately) visual range, the reading I get should fall tremendously. Obviously the meter does not trap every range above and below visual light; so what is happening here? Is it an important consideration? My goal is not to understand quantum physics, simply have a more accurate way of establishing exposure for a film that defies, or seems to defie, indexing. Regards from cajun land Sid B - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
