Marumi/Argraph is on the approved Vendor list for Solar filters:
Manufactured in Japan with high quality German Schott glass, Marumi filters are a great value at a reasonable price! These filters are perfect for use on any type of Lens including wide angle. The Digital High Grade filters are mounted in thin Aluminum rings, while the new EXUS line has incorporated the use of a Teflon coating over the threads on the thin Aluminum mount to reduce binding/catching issues. Marumi filters also have an outstanding Multi-coating that is scratch resistant, easy to clean and provides for very little loss of light.