I finally found a well-written and thorough discussion of solar photography and filters. It's on Canon's web site but is very much brand agnostic for the most part: http://learn.usa.canon.com/resources/articles/2017/solar-eclipse/solar-filters-eclipse-photography.shtml
-- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.