For anyone interested in this thread, I put together a table of filter factors for various Kodak films and Wratten filters. The information came from Kodak's Professional Photoguide.
What is clear is that filter factors are not absolute, i.e., medium yellow = a factor of 2.0, or one stop. Different films and different lighting conditions may require different factors and exposure compensation for the same filter. I hope this will be helpful. You can find the information here: http://home.earthlink.net/~belinkoff/cameras/filterfactors.html This chart does not consider meter sensitivity at all. As Bill Robb pointed out, some meters are not at all linear in their response to color. It's also been stated that some meters are calibrated for 18% grey, and others for 13% grey, although I'm not sure how that may affect things in this case. So, unless you've tested each film/filter combination, it's probably a wise idea to bracket rather than relying solely on the manufacturers stated filter factor or your meter readings. General rules-of-thumb may get useable exposures, but careful attention to all factors will assure higher quality negatives. -- Shel Belinkoff mailto:[EMAIL PROTECTED] - 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 .
