I've recently been given a box of old LF lenses, most of them in pretty rough condition, but the best is also probably the oldest: an Emil Busch Rapid Aplanat no.5 which is an 18 inch f8 lens in a lovely brass mount.
What I have not been able to on the net (and in the archives here) is any info about the angle of view/coverage of this lens. It would be useful to know so I can make up a lens board to suit – though it's going to stretch the bellows to the limit on both 5x4 and 10x8 cameras!
Richard