Reportedly, this cheap Ikea lamp (and probably others like it) are supposed to be the fastest way to clear the yellowing from Thorium. http://www.ikea.com/us/en/catalog/products/10128734/ Click on the Product Information tab to get the requisite specs if looking for something similar elsewhere. Reports that this will clear it up in just a day or so.
While the color cast is correctable in digital post-processing, the loss of light from the yellowing is significant enough a reason to get rid of it, whenever possible. What's the point of getting a fast lens and then losing 1/2 stop-1 stop to the Thorium yellowing? Darren Addy Kearney, Nebraska -- 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.
