New Modern Wide Angle + Center filter - $45

[Ed Richards]

http://www.surplusshed.com/pages/item/l10084.html

Tinkers out there - the 117mm center filter alone is worth a lot more than the price.

[CatSplat]

Yeah, I was kicking around the idea of getting one for the filter alone, but the filter thread is twice the diameter my 65mm's thread!