I picked up a few meniscus lenses from Surplus Shed and stuck them on the front of my Speed Graphic using a contraption made from plywood, wood glue, and black paint. These are from the 250mm. Both are around f/4.
http://farm7.staticflickr.com/6037/7...4e2afcef_z.jpg
scanned neg
http://farm8.staticflickr.com/7186/7...b093008f_z.jpg
scanned neg