For those interested, I mentioned casually about a month ago that I thought my Centon 500mm f8 mirror lens might take rear filters, and today I confirmed it.
While I was unscrewing the lens from my SPF, the T-adapter(?) stayed attached to the camera. It was then I noticed a M30.5 KM-500 Skylight 1A filter screwed into the back of the Centon lens. This must have come with the lens when I bought it from Jessops. I bought a 72mm Skylight 1A filter to fit to the front of the lens, and that was expensive, but it at least protects the lens. James - 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 .
