Never thought about it. PL was the label on filter boxes that contained polarizing filters when I worked the camera counter, just like O, G, A, Y, etc, coded other filter boxes. I guess CPL became popular after that for circular polarizers.
I wouldn't waste too much time on trying to ascertain a specific derivation. G -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
